diff --git a/src/main/java/de/bixilon/minosoft/data/commands/CommandArgumentNode.java b/src/main/java/de/bixilon/minosoft/data/commands/CommandArgumentNode.java
index 9087c06aa..e5ac1cdc6 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/CommandArgumentNode.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/CommandArgumentNode.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands;
 import de.bixilon.minosoft.data.commands.parser.CommandParser;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.BitByte;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
@@ -60,9 +61,9 @@ public class CommandArgumentNode extends CommandLiteralNode {
     }
 
     @Override
-    public void isSyntaxCorrect(ImprovedStringReader stringReader) throws CommandParseException {
-        parser.isParsable(properties, stringReader);
-        super.isSyntaxCorrect(stringReader);
+    public void isSyntaxCorrect(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
+        parser.isParsable(connection, properties, stringReader);
+        super.isSyntaxCorrect(connection, stringReader);
     }
 
     public enum SuggestionTypes {
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/CommandNode.java b/src/main/java/de/bixilon/minosoft/data/commands/CommandNode.java
index cd6a4eda6..397dc4fcb 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/CommandNode.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/CommandNode.java
@@ -17,6 +17,7 @@ import com.google.errorprone.annotations.DoNotCall;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.RequiresMoreArgumentsCommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.WrongArgumentCommandParseException;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.protocol.protocol.ProtocolDefinition;
 import de.bixilon.minosoft.util.BitByte;
@@ -77,7 +78,7 @@ public abstract class CommandNode {
         return childrenIds;
     }
 
-    public void isSyntaxCorrect(ImprovedStringReader stringReader) throws CommandParseException {
+    public void isSyntaxCorrect(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
         String nextArgument = stringReader.getUntilNextCommandArgument();
         if (nextArgument.length() == 0) {
             if (isExecutable) {
@@ -87,14 +88,14 @@ public abstract class CommandNode {
         }
         if (literalChildren.containsKey(nextArgument)) {
             stringReader.skip(nextArgument.length() + ProtocolDefinition.COMMAND_SEPARATOR.length());
-            literalChildren.get(nextArgument).isSyntaxCorrect(stringReader);
+            literalChildren.get(nextArgument).isSyntaxCorrect(connection, stringReader);
             return;
         }
         CommandParseException lastException = null;
         for (CommandArgumentNode argumentNode : argumentsChildren) {
             int currentPosition = stringReader.getPosition();
             try {
-                argumentNode.isSyntaxCorrect(stringReader);
+                argumentNode.isSyntaxCorrect(connection, stringReader);
                 return;
             } catch (CommandParseException e) {
                 lastException = e;
@@ -108,11 +109,11 @@ public abstract class CommandNode {
         throw new WrongArgumentCommandParseException(stringReader, nextArgument);
     }
 
-    public void isSyntaxCorrect(String string) throws CommandParseException {
+    public void isSyntaxCorrect(Connection connection, String string) throws CommandParseException {
         // replace multiple spaces with nothing
         string = string.replaceAll("\\s{2,}", " ");
         ImprovedStringReader stringReader = new ImprovedStringReader(string);
-        isSyntaxCorrect(stringReader);
+        isSyntaxCorrect(connection, stringReader);
     }
 
     public enum NodeTypes {
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/CommandRootNode.java b/src/main/java/de/bixilon/minosoft/data/commands/CommandRootNode.java
index 618c11046..dbc4a1bb2 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/CommandRootNode.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/CommandRootNode.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.UnknownCommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.WrongArgumentCommandParseException;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -25,9 +26,9 @@ public class CommandRootNode extends CommandNode {
     }
 
     @Override
-    public void isSyntaxCorrect(ImprovedStringReader stringReader) throws CommandParseException {
+    public void isSyntaxCorrect(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
         try {
-            super.isSyntaxCorrect(stringReader);
+            super.isSyntaxCorrect(connection, stringReader);
         } catch (WrongArgumentCommandParseException e) {
             if (e.getStartIndex() == 0) {
                 // beginn of string
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/BooleanParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/BooleanParser.java
index 80117af5d..4fff866e6 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/BooleanParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/BooleanParser.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands.parser;
 import de.bixilon.minosoft.data.commands.parser.exception.BooleanCommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
 import javax.annotation.Nullable;
@@ -24,7 +25,7 @@ public class BooleanParser extends CommandParser {
     public static final BooleanParser BOOLEAN_PARSER = new BooleanParser();
 
     @Override
-    public void isParsable(@Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, @Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         String argument = stringReader.readUntilNextCommandArgument();
         if (!argument.equals("true") && !argument.equals("false")) {
             throw new BooleanCommandParseException(stringReader, argument);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/CommandParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/CommandParser.java
index e8f29cea1..7242975df 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/CommandParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/CommandParser.java
@@ -17,6 +17,7 @@ import com.google.common.collect.HashBiMap;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
 import de.bixilon.minosoft.data.mappings.ModIdentifier;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -46,6 +47,6 @@ public abstract class CommandParser {
         return null;
     }
 
-    public abstract void isParsable(@Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException;
+    public abstract void isParsable(Connection connection, @Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException;
 
 }
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/DoubleParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/DoubleParser.java
index dcdd71274..349366efe 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/DoubleParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/DoubleParser.java
@@ -18,6 +18,7 @@ import de.bixilon.minosoft.data.commands.parser.exception.number.DoubleCommandPa
 import de.bixilon.minosoft.data.commands.parser.exception.number.ValueOutOfRangeCommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.DoubleParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -34,7 +35,7 @@ public class DoubleParser extends CommandParser {
     }
 
     @Override
-    public void isParsable(ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         String argument = stringReader.readUntilNextCommandArgument();
         try {
             double value = Double.parseDouble(argument);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/DummyParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/DummyParser.java
index 349b20202..84316699d 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/DummyParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/DummyParser.java
@@ -15,6 +15,7 @@ package de.bixilon.minosoft.data.commands.parser;
 
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
 import javax.annotation.Nullable;
@@ -24,6 +25,6 @@ public class DummyParser extends CommandParser {
     public static final DummyParser DUMMY_PARSER = new DummyParser();
 
     @Override
-    public void isParsable(@Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, @Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/EntityParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/EntityParser.java
index f2af66039..7348e0b4e 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/EntityParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/EntityParser.java
@@ -18,6 +18,7 @@ import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.entity.*;
 import de.bixilon.minosoft.data.commands.parser.properties.EntityParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.protocol.protocol.ProtocolDefinition;
 import de.bixilon.minosoft.util.Util;
@@ -49,8 +50,9 @@ public class EntityParser extends CommandParser {
         ENTITY_FILTER_PARAMETER_LIST.put("x_rotation", RangeSelectorArgumentParser.ROTATION_SELECTOR_ARGUMENT_PARSER);
         ENTITY_FILTER_PARAMETER_LIST.put("y_rotation", RangeSelectorArgumentParser.ROTATION_SELECTOR_ARGUMENT_PARSER);
         ENTITY_FILTER_PARAMETER_LIST.put("tag", StringSelectorArgumentParser.STRING_SELECTOR_ARGUMENT_PARSER);
+        ENTITY_FILTER_PARAMETER_LIST.put("type", IdentifierSelectorArgumentParser.ENTITY_TYPE_IDENTIFIER_SELECTOR_ARGUMENT_PARSER);
 
-        // ToDo: advancements, nbt, type, scores
+        // ToDo: advancements, nbt, scores
     }
 
     @Override
@@ -59,7 +61,7 @@ public class EntityParser extends CommandParser {
     }
 
     @Override
-    public void isParsable(ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         EntityParserProperties entityParserProperties = (EntityParserProperties) properties;
         if (stringReader.getChar().equals("@")) {
             // selector
@@ -100,7 +102,7 @@ public class EntityParser extends CommandParser {
                 stringReader.skipSpaces();
 
                 EntitySelectorArgumentParser parser = ENTITY_FILTER_PARAMETER_LIST.get(parameterName);
-                parser.isParsable(stringReader);
+                parser.isParsable(connection, stringReader);
 
                 stringReader.skipSpaces();
                 parameters.add(parameterName);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/FloatParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/FloatParser.java
index 92a79990a..a5a637941 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/FloatParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/FloatParser.java
@@ -18,6 +18,7 @@ import de.bixilon.minosoft.data.commands.parser.exception.number.FloatCommandPar
 import de.bixilon.minosoft.data.commands.parser.exception.number.ValueOutOfRangeCommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.FloatParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -31,7 +32,7 @@ public class FloatParser extends CommandParser {
     }
 
     @Override
-    public void isParsable(ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         String argument = stringReader.readUntilNextCommandArgument();
         try {
             float value = Float.parseFloat(argument);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/IntegerParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/IntegerParser.java
index 79153d065..b86f06f48 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/IntegerParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/IntegerParser.java
@@ -18,6 +18,7 @@ import de.bixilon.minosoft.data.commands.parser.exception.number.IntegerCommandP
 import de.bixilon.minosoft.data.commands.parser.exception.number.ValueOutOfRangeCommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.IntegerParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -34,7 +35,7 @@ public class IntegerParser extends CommandParser {
     }
 
     @Override
-    public void isParsable(ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         String argument = stringReader.readUntilNextCommandArgument();
         try {
             int value = Integer.parseInt(argument);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/MessageParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/MessageParser.java
index b08e55f2d..dce876420 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/MessageParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/MessageParser.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands.parser;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.StringParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -32,7 +33,7 @@ public class MessageParser extends StringParser {
     }
 
     @Override
-    public void isParsable(@Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
-        super.isParsable(STRING_PARSER_PROPERTIES, stringReader);
+    public void isParsable(Connection connection, @Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+        super.isParsable(connection, STRING_PARSER_PROPERTIES, stringReader);
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/RangeParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/RangeParser.java
index edf2d2b72..46d3c8369 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/RangeParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/RangeParser.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands.parser;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.RangeParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -30,7 +31,7 @@ public class RangeParser extends CommandParser {
     }
 
     @Override
-    public void isParsable(@Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, @Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         // ToDo
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/ScoreHolderParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/ScoreHolderParser.java
index 6b2d483a5..6415abe28 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/ScoreHolderParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/ScoreHolderParser.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands.parser;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.ScoreHolderParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -30,7 +31,7 @@ public class ScoreHolderParser extends CommandParser {
     }
 
     @Override
-    public void isParsable(@Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, @Nullable ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         // ToDo
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/StringParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/StringParser.java
index 86ffd555a..500cef6a0 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/StringParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/StringParser.java
@@ -17,6 +17,7 @@ import de.bixilon.minosoft.data.commands.parser.exception.BlankStringCommandPars
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.ParserProperties;
 import de.bixilon.minosoft.data.commands.parser.properties.StringParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.protocol.InByteBuffer;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -29,7 +30,7 @@ public class StringParser extends CommandParser {
     }
 
     @Override
-    public void isParsable(ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ParserProperties properties, ImprovedStringReader stringReader) throws CommandParseException {
         StringParserProperties stringParserProperties = ((StringParserProperties) properties);
         String string = switch (stringParserProperties.getSetting()) {
             case SINGLE_WORD -> stringReader.readUntilNextCommandArgument();
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/DoubleSelectorArgumentParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/DoubleSelectorArgumentParser.java
index 8736ec8d9..e87ba00e7 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/DoubleSelectorArgumentParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/DoubleSelectorArgumentParser.java
@@ -15,6 +15,7 @@ package de.bixilon.minosoft.data.commands.parser.entity;
 
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.number.DoubleCommandParseException;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.Pair;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -22,7 +23,7 @@ public class DoubleSelectorArgumentParser extends EntitySelectorArgumentParser {
     public static final DoubleSelectorArgumentParser DOUBLE_SELECTOR_ARGUMENT_PARSER = new DoubleSelectorArgumentParser();
 
     @Override
-    public void isParsable(ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
         Pair<String, String> match = readNextArgument(stringReader);
         try {
             Double.parseDouble(match.key);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/EntitySelectorArgumentParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/EntitySelectorArgumentParser.java
index 6648f7c8d..59d4bbfaf 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/EntitySelectorArgumentParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/EntitySelectorArgumentParser.java
@@ -14,13 +14,14 @@
 package de.bixilon.minosoft.data.commands.parser.entity;
 
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.Pair;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
 public abstract class EntitySelectorArgumentParser {
     private static final String[] ENTITY_VALUE_TERMINATORS = {",", " ", "]"};
 
-    public abstract void isParsable(ImprovedStringReader stringReader) throws CommandParseException;
+    public abstract void isParsable(Connection connection, ImprovedStringReader stringReader) throws CommandParseException;
 
     protected Pair<String, String> readNextArgument(ImprovedStringReader stringReader) {
         Pair<String, String> match = stringReader.readUntil(ENTITY_VALUE_TERMINATORS);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/IdentifierSelectorArgumentParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/IdentifierSelectorArgumentParser.java
new file mode 100644
index 000000000..70f76f140
--- /dev/null
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/IdentifierSelectorArgumentParser.java
@@ -0,0 +1,44 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.data.commands.parser.entity;
+
+import de.bixilon.minosoft.data.EntityClassMappings;
+import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
+import de.bixilon.minosoft.data.commands.parser.exception.entity.UnknownEntityCommandParseException;
+import de.bixilon.minosoft.data.mappings.ModIdentifier;
+import de.bixilon.minosoft.protocol.network.Connection;
+import de.bixilon.minosoft.util.Pair;
+import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
+
+public class IdentifierSelectorArgumentParser extends EntitySelectorArgumentParser {
+    public static final IdentifierSelectorArgumentParser ENTITY_TYPE_IDENTIFIER_SELECTOR_ARGUMENT_PARSER = new IdentifierSelectorArgumentParser();
+
+
+    @Override
+    public void isParsable(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
+        Pair<String, String> match = readNextArgument(stringReader);
+        String value = match.key;
+        if (match.key.startsWith("!")) {
+            value = value.substring(1);
+        }
+        ModIdentifier identifier = new ModIdentifier(value);
+        if (this == ENTITY_TYPE_IDENTIFIER_SELECTOR_ARGUMENT_PARSER) {
+            if (!EntityClassMappings.ENTITY_CLASS_MAPPINGS.containsValue(identifier)) {
+                throw new UnknownEntityCommandParseException(stringReader, match.key);
+            }
+            return;
+        }
+        throw new RuntimeException();
+    }
+}
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/IntegerSelectorArgumentParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/IntegerSelectorArgumentParser.java
index c3a85fc25..a8188fb50 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/IntegerSelectorArgumentParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/IntegerSelectorArgumentParser.java
@@ -15,6 +15,7 @@ package de.bixilon.minosoft.data.commands.parser.entity;
 
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.number.IntegerCommandParseException;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.Pair;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -22,7 +23,7 @@ public class IntegerSelectorArgumentParser extends EntitySelectorArgumentParser
     public static final IntegerSelectorArgumentParser INTEGER_SELECTOR_ARGUMENT_PARSER = new IntegerSelectorArgumentParser();
 
     @Override
-    public void isParsable(ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
         Pair<String, String> match = readNextArgument(stringReader);
         try {
             Integer.parseInt(match.key);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/ListSelectorArgumentParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/ListSelectorArgumentParser.java
index 1073498aa..8d22fede3 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/ListSelectorArgumentParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/ListSelectorArgumentParser.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands.parser.entity;
 import de.bixilon.minosoft.data.GameModes;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.entity.UnknownEnumValueCommandParseException;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.Pair;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -44,7 +45,7 @@ public class ListSelectorArgumentParser extends EntitySelectorArgumentParser {
     }
 
     @Override
-    public void isParsable(ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
         Pair<String, String> match = readNextArgument(stringReader);
         String value = match.key;
         if (match.key.startsWith("!")) {
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/RangeSelectorArgumentParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/RangeSelectorArgumentParser.java
index 54fc8fd94..3e261ad96 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/RangeSelectorArgumentParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/RangeSelectorArgumentParser.java
@@ -15,6 +15,7 @@ package de.bixilon.minosoft.data.commands.parser.entity;
 
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.exception.number.*;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.Pair;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
@@ -46,7 +47,7 @@ public class RangeSelectorArgumentParser extends EntitySelectorArgumentParser {
     }
 
     @Override
-    public void isParsable(ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
         Pair<String, String> match = readNextArgument(stringReader);
 
         if (match.key.contains("..")) {
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/StringSelectorArgumentParser.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/StringSelectorArgumentParser.java
index 1021983b7..509fc096b 100644
--- a/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/StringSelectorArgumentParser.java
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/entity/StringSelectorArgumentParser.java
@@ -16,6 +16,7 @@ package de.bixilon.minosoft.data.commands.parser.entity;
 import de.bixilon.minosoft.data.commands.parser.StringParser;
 import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
 import de.bixilon.minosoft.data.commands.parser.properties.StringParserProperties;
+import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
 
 public class StringSelectorArgumentParser extends EntitySelectorArgumentParser {
@@ -23,10 +24,10 @@ public class StringSelectorArgumentParser extends EntitySelectorArgumentParser {
     private static final StringParserProperties STRING_PARSER_PROPERTIES = new StringParserProperties(StringParserProperties.StringSettings.QUOTABLE_PHRASE, true);
 
     @Override
-    public void isParsable(ImprovedStringReader stringReader) throws CommandParseException {
+    public void isParsable(Connection connection, ImprovedStringReader stringReader) throws CommandParseException {
         // if it starts with a quote, it will end with a quote
         if (stringReader.get(1).equals("\"")) {
-            StringParser.STRING_PARSER.isParsable(STRING_PARSER_PROPERTIES, stringReader);
+            StringParser.STRING_PARSER.isParsable(connection, STRING_PARSER_PROPERTIES, stringReader);
             return;
         }
         readNextArgument(stringReader);
diff --git a/src/main/java/de/bixilon/minosoft/data/commands/parser/exception/entity/UnknownEntityCommandParseException.java b/src/main/java/de/bixilon/minosoft/data/commands/parser/exception/entity/UnknownEntityCommandParseException.java
new file mode 100644
index 000000000..97cdfe0f1
--- /dev/null
+++ b/src/main/java/de/bixilon/minosoft/data/commands/parser/exception/entity/UnknownEntityCommandParseException.java
@@ -0,0 +1,30 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.data.commands.parser.exception.entity;
+
+import de.bixilon.minosoft.data.commands.parser.exception.CommandParseException;
+import de.bixilon.minosoft.util.buffers.ImprovedStringReader;
+
+public class UnknownEntityCommandParseException extends CommandParseException {
+
+    private static final String ERROR_MESSAGE = "Unknown entity type!";
+
+    public UnknownEntityCommandParseException(ImprovedStringReader command, String currentArgument) {
+        super(ERROR_MESSAGE, command, currentArgument);
+    }
+
+    public UnknownEntityCommandParseException(ImprovedStringReader command, String currentArgument, Throwable cause) {
+        super(ERROR_MESSAGE, command, currentArgument, cause);
+    }
+}
diff --git a/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java b/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java
index 59ff43ebc..250c78961 100644
--- a/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java
+++ b/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java
@@ -818,7 +818,7 @@ public class PacketHandler {
         };
         for (String command : commands) {
             try {
-                pkg.getRootNode().isSyntaxCorrect(command);
+                pkg.getRootNode().isSyntaxCorrect(connection, command);
                 Log.game("Command \"%s\" is valid", command);
             } catch (CommandParseException e) {
                 Log.game("Command \"%s\" is invalid, %s: %s", command, e.getClass().getSimpleName(), e.getErrorMessage());
diff --git a/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketSender.java b/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketSender.java
index 7437d09b5..f2feb9db7 100644
--- a/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketSender.java
+++ b/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketSender.java
@@ -25,6 +25,7 @@ import de.bixilon.minosoft.protocol.packets.serverbound.play.*;
 import java.util.UUID;
 
 public class PacketSender {
+    public static final String[] ILLEGAL_CHAT_CHARS = new String[]{"§"};
     final Connection connection;
 
     public PacketSender(Connection connection) {
@@ -36,6 +37,11 @@ public class PacketSender {
     }
 
     public void sendChatMessage(String message) {
+        for (String illegalChar : ILLEGAL_CHAT_CHARS) {
+            if (message.contains(illegalChar)) {
+                throw new IllegalArgumentException(String.format("%s is not allowed in chat", illegalChar));
+            }
+        }
         ChatMessageSendingEvent event = new ChatMessageSendingEvent(connection, message);
         if (connection.fireEvent(event)) {
             return;