Figured out most of the battle action packets; 0x139, 0x13a, 0x13b.

FFXIVClassic Map Server/packets/send/Actor/battle/BattleActionX01Packet.cs

@@ -0,0 +1,49 @@
+using FFXIVClassic_Lobby_Server.packets;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FFXIVClassic_Map_Server.packets.send.actor.battle
+{
+    class BattleActionX01Packet
+    {
+        public const ushort OPCODE = 0x0139;
+        public const uint PACKET_SIZE = 0x58;
+
+        public static SubPacket buildPacket(uint playerActorID, uint sourceActorId, uint targetActorId, uint animationId, uint effectId, ushort worldMasterTextId, ushort commandId, ushort amount, byte param)
+        {
+            byte[] data = new byte[PACKET_SIZE - 0x20];
+
+            using (MemoryStream mem = new MemoryStream(data))
+            {
+                using (BinaryWriter binWriter = new BinaryWriter(mem))
+                {
+                    binWriter.Write((UInt32)sourceActorId);
+                    binWriter.Write((UInt32)animationId);
+
+                    //Missing... last value is float, string in here as well?
+
+                    binWriter.Seek(0x20, SeekOrigin.Begin);
+                    binWriter.Write((UInt32)1); //Num actions (always 1 for this)
+                    binWriter.Write((UInt16)commandId);
+                    binWriter.Write((UInt16)810); //?
+
+                    binWriter.Write((UInt32)targetActorId);
+
+                    binWriter.Write((UInt16)amount);
+                    binWriter.Write((UInt16)worldMasterTextId);
+
+                    binWriter.Write((UInt32)effectId);
+
+                    binWriter.Write((Byte)param);
+                    binWriter.Write((Byte)1); //?
+                }
+            }
+
+            return new SubPacket(OPCODE, sourceActorId, playerActorID, data);
+        }
+    }
+}