diff --git a/TrueCraft.API/PathResult.cs b/TrueCraft.API/PathResult.cs
index 23d7da8..ea15708 100644
--- a/TrueCraft.API/PathResult.cs
+++ b/TrueCraft.API/PathResult.cs
@@ -5,6 +5,12 @@ namespace TrueCraft.API
 {
     public class PathResult
     {
+        public PathResult()
+        {
+            Index = 0;
+        }
+
         public IList<Coordinates3D> Waypoints;
+        public int Index;
     }
 }
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/CowEntity.cs b/TrueCraft.Core/Entities/CowEntity.cs
new file mode 100644
index 0000000..323b96d
--- /dev/null
+++ b/TrueCraft.Core/Entities/CowEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class CowEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.9, 1.3, 0.9);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 10;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 92;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/CreeperEntity.cs b/TrueCraft.Core/Entities/CreeperEntity.cs
new file mode 100644
index 0000000..631fdd1
--- /dev/null
+++ b/TrueCraft.Core/Entities/CreeperEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class CreeperEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.6, 1.8, 0.6);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 20;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 50;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/GhastEntity.cs b/TrueCraft.Core/Entities/GhastEntity.cs
new file mode 100644
index 0000000..9ee1b45
--- /dev/null
+++ b/TrueCraft.Core/Entities/GhastEntity.cs
@@ -0,0 +1,39 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class GhastEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(4.0);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 10;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 56;
+            }
+        }
+
+        public override bool BeginUpdate()
+        {
+            // Ghasts can fly, no need to work out gravity
+            // TODO: Think about how to deal with walls and such
+            return false;
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/GiantZombieEntity.cs b/TrueCraft.Core/Entities/GiantZombieEntity.cs
new file mode 100644
index 0000000..e899aae
--- /dev/null
+++ b/TrueCraft.Core/Entities/GiantZombieEntity.cs
@@ -0,0 +1,33 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class GiantZombieEntity : ZombieEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.6, 1.8, 0.6) * 6;
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 100;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 53;
+            }
+        }
+    }
+}
+
diff --git a/TrueCraft.Core/Entities/HenEntity.cs b/TrueCraft.Core/Entities/HenEntity.cs
new file mode 100644
index 0000000..5b0a0cc
--- /dev/null
+++ b/TrueCraft.Core/Entities/HenEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class HenEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.4, 0.3, 0.4);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 4;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 93;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/MobEntity.cs b/TrueCraft.Core/Entities/MobEntity.cs
new file mode 100644
index 0000000..620edb1
--- /dev/null
+++ b/TrueCraft.Core/Entities/MobEntity.cs
@@ -0,0 +1,138 @@
+using System;
+using TrueCraft.API.Networking;
+using TrueCraft.Core.Networking.Packets;
+using TrueCraft.API.Entities;
+using TrueCraft.API;
+using TrueCraft.API.Server;
+using System.Linq;
+
+namespace TrueCraft.Core.Entities
+{
+    public abstract class MobEntity : LivingEntity, IAABBEntity
+    {
+        public MobEntity()
+        {
+            Speed = 1; // TODO: WTF
+        }
+
+        public override IPacket SpawnPacket
+        {
+            get
+            {
+                return new SpawnMobPacket(EntityID, MobType,
+                    MathHelper.CreateAbsoluteInt(Position.X),
+                    MathHelper.CreateAbsoluteInt(Position.Y),
+                    MathHelper.CreateAbsoluteInt(Position.Z),
+                    MathHelper.CreateRotationByte(Yaw),
+                    MathHelper.CreateRotationByte(Pitch),
+                    Metadata);
+            }
+        }
+
+        public abstract sbyte MobType { get; }
+
+        public virtual void TerrainCollision(Vector3 collisionPoint, Vector3 collisionDirection)
+        {
+            // This space intentionally left blank
+        }
+
+        public BoundingBox BoundingBox
+        {
+            get
+            {
+                return new BoundingBox(Position, Position + Size);
+            }
+        }
+
+        public virtual bool BeginUpdate()
+        {
+            EnablePropertyChange = false;
+            return true;
+        }
+
+        public virtual void EndUpdate(Vector3 newPosition)
+        {
+            EnablePropertyChange = true;
+            Position = newPosition;
+        }
+
+        public float AccelerationDueToGravity
+        {
+            get
+            {
+                return 0.08f;
+            }
+        }
+
+        public float Drag
+        {
+            get
+            {
+                return 0.02f;
+            }
+        }
+
+        public float TerminalVelocity
+        {
+            get
+            {
+                return 3.92f;
+            }
+        }
+
+        public PathResult CurrentPath { get; set; }
+
+        /// <summary>
+        /// Mob's current speed in m/s.
+        /// </summary>
+        public virtual double Speed { get; }
+
+        protected DateTime CurrentNodeStart = DateTime.MinValue;
+
+        public void Face(Vector3 target)
+        {
+            var diff = target - Position;
+            Yaw = (float)MathHelper.RadiansToDegrees(-(Math.Atan2(diff.X, diff.Z) - Math.PI) + Math.PI); // "Flip" over the 180 mark
+        }
+
+        protected void AdvancePath(bool faceRoute = true)
+        {
+            if (CurrentPath != null)
+            {
+                if (CurrentNodeStart == DateTime.MinValue)
+                    CurrentNodeStart = DateTime.UtcNow;
+                // Advance along path
+                var target = (Vector3)CurrentPath.Waypoints[CurrentPath.Index];
+                var diff = target - Position;
+                var max = (DateTime.UtcNow - CurrentNodeStart).TotalSeconds * Speed;
+                if (faceRoute)
+                    Face(target);
+                diff.Clamp(max);
+                Position += diff;
+                if (Position == target)
+                {
+                    CurrentPath.Index++;
+                    if (CurrentPath.Index >= CurrentPath.Waypoints.Count)
+                    {
+                        CurrentPath = null;
+                        CurrentNodeStart = DateTime.MinValue;
+                        // TODO: Raise path complete event or something?
+                    }
+                }
+            }
+        }
+
+        public override void Update(IEntityManager entityManager)
+        {
+            AdvancePath();
+            var nearby = entityManager.EntitiesInRange(Position, 30);
+            var player = nearby.FirstOrDefault(e => e is PlayerEntity);
+            if (player != null)
+            {
+                Face(player.Position);
+            }
+            base.Update(entityManager);
+        }
+    }
+}
+
diff --git a/TrueCraft.Core/Entities/PigEntity.cs b/TrueCraft.Core/Entities/PigEntity.cs
new file mode 100644
index 0000000..289e922
--- /dev/null
+++ b/TrueCraft.Core/Entities/PigEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class PigEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.9);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 10;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 90;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/SheepEntity.cs b/TrueCraft.Core/Entities/SheepEntity.cs
new file mode 100644
index 0000000..1b0e332
--- /dev/null
+++ b/TrueCraft.Core/Entities/SheepEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class SheepEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.9, 1.3, 0.9);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 8;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 91;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/SkeletonEntity.cs b/TrueCraft.Core/Entities/SkeletonEntity.cs
new file mode 100644
index 0000000..d5a81fd
--- /dev/null
+++ b/TrueCraft.Core/Entities/SkeletonEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class SkeletonEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.6, 1.8, 0.6);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 20;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 51;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/SlimeEntity.cs b/TrueCraft.Core/Entities/SlimeEntity.cs
new file mode 100644
index 0000000..413046f
--- /dev/null
+++ b/TrueCraft.Core/Entities/SlimeEntity.cs
@@ -0,0 +1,54 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class SlimeEntity : MobEntity
+    {
+        public byte SlimeSize { get; set; }
+
+        public SlimeEntity() : this(4)
+        {
+        }
+
+        public SlimeEntity(byte size)
+        {
+            SlimeSize = size;
+        }
+
+        public override MetadataDictionary Metadata
+        {
+            get
+            {
+                var meta = base.Metadata;
+                meta[16] = new MetadataByte(SlimeSize);
+                return meta;
+            }
+        }
+
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.6 * SlimeSize);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return (short)(Math.Pow(SlimeSize, 2));
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 55;
+            }
+        }
+    }
+}
+
diff --git a/TrueCraft.Core/Entities/SpiderEntity.cs b/TrueCraft.Core/Entities/SpiderEntity.cs
new file mode 100644
index 0000000..b9bb17d
--- /dev/null
+++ b/TrueCraft.Core/Entities/SpiderEntity.cs
@@ -0,0 +1,35 @@
+using System;
+using TrueCraft.API.Networking;
+using TrueCraft.API;
+using TrueCraft.Core.Networking.Packets;
+
+namespace TrueCraft.Core.Entities
+{
+    public class SpiderEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(1.4, 0.9, 1.4);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 16;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 52;
+            }
+        }
+    }
+}
+
diff --git a/TrueCraft.Core/Entities/SquidEntity.cs b/TrueCraft.Core/Entities/SquidEntity.cs
new file mode 100644
index 0000000..c9e8fa3
--- /dev/null
+++ b/TrueCraft.Core/Entities/SquidEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class SquidEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.95);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 10;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 94;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/ZombieEntity.cs b/TrueCraft.Core/Entities/ZombieEntity.cs
new file mode 100644
index 0000000..5185b08
--- /dev/null
+++ b/TrueCraft.Core/Entities/ZombieEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class ZombieEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.6, 1.8, 0.6);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 20;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 54;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Entities/ZombiePigmanEntity.cs b/TrueCraft.Core/Entities/ZombiePigmanEntity.cs
new file mode 100644
index 0000000..f1931a1
--- /dev/null
+++ b/TrueCraft.Core/Entities/ZombiePigmanEntity.cs
@@ -0,0 +1,32 @@
+using System;
+using TrueCraft.API;
+
+namespace TrueCraft.Core.Entities
+{
+    public class ZombiePigmanEntity : MobEntity
+    {
+        public override Size Size
+        {
+            get
+            {
+                return new Size(0.6, 1.8, 0.6);
+            }
+        }
+
+        public override short MaxHealth
+        {
+            get
+            {
+                return 20;
+            }
+        }
+
+        public override sbyte MobType
+        {
+            get
+            {
+                return 57;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/TrueCraft.Core/Networking/Packets/SpawnMobPacket.cs b/TrueCraft.Core/Networking/Packets/SpawnMobPacket.cs
index 2047966..0cc9013 100644
--- a/TrueCraft.Core/Networking/Packets/SpawnMobPacket.cs
+++ b/TrueCraft.Core/Networking/Packets/SpawnMobPacket.cs
@@ -11,11 +11,23 @@ namespace TrueCraft.Core.Networking.Packets
     {
         public byte ID { get { return 0x18; } }
 
+        public SpawnMobPacket(int entityId, sbyte type, int x, int y, int z, sbyte yaw, sbyte pitch, MetadataDictionary metadata)
+        {
+            EntityID = entityId;
+            MobType = type;
+            X = x;
+            Y = y;
+            Z = z;
+            Yaw = yaw;
+            Pitch = pitch;
+            Metadata = metadata;
+        }
+
         public int EntityID;
         public sbyte MobType;
         public int X, Y, Z;
         public sbyte Yaw, Pitch;
-        public MetadataDictionary Metadata; // TODO: Import metadata implementation from Craft.Net
+        public MetadataDictionary Metadata;
 
         public void ReadPacket(IMinecraftStream stream)
         {
diff --git a/TrueCraft.Core/TrueCraft.Core.csproj b/TrueCraft.Core/TrueCraft.Core.csproj
index 7494e45..9f8213d 100644
--- a/TrueCraft.Core/TrueCraft.Core.csproj
+++ b/TrueCraft.Core/TrueCraft.Core.csproj
@@ -330,6 +330,20 @@
     <Compile Include="Lighting\WorldLighting.cs" />
     <Compile Include="AI\AStarPathFinder.cs" />
     <Compile Include="AI\PriorityQueue.cs" />
+    <Compile Include="Entities\SpiderEntity.cs" />
+    <Compile Include="Entities\MobEntity.cs" />
+    <Compile Include="Entities\CreeperEntity.cs" />
+    <Compile Include="Entities\SkeletonEntity.cs" />
+    <Compile Include="Entities\GiantZombieEntity.cs" />
+    <Compile Include="Entities\ZombieEntity.cs" />
+    <Compile Include="Entities\SlimeEntity.cs" />
+    <Compile Include="Entities\GhastEntity.cs" />
+    <Compile Include="Entities\ZombiePigmanEntity.cs" />
+    <Compile Include="Entities\PigEntity.cs" />
+    <Compile Include="Entities\SheepEntity.cs" />
+    <Compile Include="Entities\CowEntity.cs" />
+    <Compile Include="Entities\HenEntity.cs" />
+    <Compile Include="Entities\SquidEntity.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
diff --git a/TrueCraft/Commands/DebugCommands.cs b/TrueCraft/Commands/DebugCommands.cs
index 7b063fa..97df4ad 100644
--- a/TrueCraft/Commands/DebugCommands.cs
+++ b/TrueCraft/Commands/DebugCommands.cs
@@ -1,6 +1,14 @@
 using TrueCraft.API.Networking;
 using TrueCraft.Core.Networking.Packets;
 using TrueCraft.API;
+using System;
+using TrueCraft.API.Entities;
+using TrueCraft.Core;
+using System.Collections.Generic;
+using System.Linq;
+using TrueCraft.Core.AI;
+using TrueCraft.Core.Entities;
+using System.Threading.Tasks;
 
 namespace TrueCraft.Commands
 {
@@ -37,6 +45,167 @@ namespace TrueCraft.Commands
         }
     }
 
+    public class SpawnCommand : Command
+    {
+        public override string Name
+        {
+            get { return "spawn"; }
+        }
+
+        public override string Description
+        {
+            get { return "Spawns a mob."; }
+        }
+
+        public override string[] Aliases
+        {
+            get { return new string[0]; }
+        }
+
+        public override void Handle(IRemoteClient client, string alias, string[] arguments)
+        {
+            if (arguments.Length != 1)
+            {
+                Help(client, alias, arguments);
+                return;
+            }
+            var entityTypes = new List<Type>();
+            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
+            {
+                foreach (var t in assembly.GetTypes())
+                {
+                    if (typeof(IEntity).IsAssignableFrom(t) && !t.IsAbstract && !t.IsInterface)
+                        entityTypes.Add(t);
+                }
+            }
+
+            arguments[0] = arguments[0].ToUpper();
+            var type = entityTypes.SingleOrDefault(t => t.Name.ToUpper() == arguments[0] + "ENTITY");
+            if (type == null)
+            {
+                client.SendMessage(ChatColor.Red + "Unknown entity type.");
+                return;
+            }
+            var entity = (IEntity)Activator.CreateInstance(type);
+            var em = client.Server.GetEntityManagerForWorld(client.World);
+            entity.Position = client.Entity.Position + MathHelper.FowardVector(client.Entity.Yaw) * 3;
+            em.SpawnEntity(entity);
+        }
+
+        public override void Help(IRemoteClient client, string alias, string[] arguments)
+        {
+            client.SendMessage("/spawn [type]: Spawns a mob of that type.");
+        }
+    }
+
+    public class ToMeCommand : Command
+    {
+        public override string Name
+        {
+            get { return "tome"; }
+        }
+
+        public override string Description
+        {
+            get { return "Moves a mob towards your position."; }
+        }
+
+        public override string[] Aliases
+        {
+            get { return new string[0]; }
+        }
+
+        public override void Handle(IRemoteClient client, string alias, string[] arguments)
+        {
+            if (arguments.Length != 1)
+            {
+                Help(client, alias, arguments);
+                return;
+            }
+
+            int id;
+            if (!int.TryParse(arguments[0], out id))
+            {
+                Help(client, alias, arguments);
+                return;
+            }
+
+            var manager = client.Server.GetEntityManagerForWorld(client.World);
+            var entity = manager.GetEntityByID(id) as MobEntity;
+            if (entity == null)
+            {
+                client.SendMessage(ChatColor.Red + "An entity with that ID does not exist in this world.");
+                return;
+            }
+
+            Task.Factory.StartNew(() =>
+            {
+                var astar = new AStarPathFinder();
+                var path = astar.FindPath(client.World, entity.BoundingBox, (Coordinates3D)entity.Position, (Coordinates3D)client.Entity.Position);
+                if (path == null)
+                {
+                    client.SendMessage(ChatColor.Red + "It is impossible for this entity to reach you.");
+                    return;
+                }
+                entity.CurrentPath = path;
+            });
+        }
+
+        public override void Help(IRemoteClient client, string alias, string[] arguments)
+        {
+            client.SendMessage("/tome [id]: Moves a mob to your position.");
+        }
+    }
+
+    public class DestroyCommand : Command
+    {
+        public override string Name
+        {
+            get { return "destroy"; }
+        }
+
+        public override string Description
+        {
+            get { return "Destroys a mob. Violently."; }
+        }
+
+        public override string[] Aliases
+        {
+            get { return new string[0]; }
+        }
+
+        public override void Handle(IRemoteClient client, string alias, string[] arguments)
+        {
+            if (arguments.Length != 1)
+            {
+                Help(client, alias, arguments);
+                return;
+            }
+
+            int id;
+            if (!int.TryParse(arguments[0], out id))
+            {
+                Help(client, alias, arguments);
+                return;
+            }
+
+            var manager = client.Server.GetEntityManagerForWorld(client.World);
+            var entity = manager.GetEntityByID(id) as MobEntity;
+            if (entity == null)
+            {
+                client.SendMessage(ChatColor.Red + "An entity with that ID does not exist in this world.");
+                return;
+            }
+
+            manager.DespawnEntity(entity);
+        }
+
+        public override void Help(IRemoteClient client, string alias, string[] arguments)
+        {
+            client.SendMessage("/destroy [id]: " + Description);
+        }
+    }
+
     public class TrashCommand : Command
     {
         public override string Name
diff --git a/TrueCraft/RemoteClient.cs b/TrueCraft/RemoteClient.cs
index 2f49579..0b62463 100644
--- a/TrueCraft/RemoteClient.cs
+++ b/TrueCraft/RemoteClient.cs
@@ -316,6 +316,9 @@ namespace TrueCraft
                 catch (OperationCanceledException)
                 {
                 }
+                catch (NullReferenceException)
+                {
+                }
 
                 var packets = PacketReader.ReadPackets(this, e.Buffer, e.Offset, e.BytesTransferred);