Fix direction knock back for region skills

Maple2.Server.Game/Model/Field/Actor/Actor.cs

@@ -94,10 +94,27 @@ public virtual void ApplyEffect(IActor caster, IActor owner, SkillEffectMetadata
     }
 
     public virtual void ApplyDamage(IActor caster, DamageRecord damage, SkillMetadataAttack attack) {
+        // Determine the source position.
+        // For region/trigger skills, the caster is FieldActor at origin - use damage.Position (the skill region's position) instead.
+        Vector3 sourcePosition = caster.Position;
+        if (sourcePosition.LengthSquared() < 0.001f && damage.Position.LengthSquared() > 0.001f) {
+            sourcePosition = damage.Position;
+        }
+
         var targetRecord = new DamageRecordTarget(this) {
-            Position = caster.Position,
-            Direction = caster.Rotation, // Idk why this is wrong
+            Position = sourcePosition,
+            Direction = caster.Transform.FrontAxis,
         };
+
+        if (attack.Damage.Push != null) {
+            // Direction should point from source toward the target (the push direction).
+            Vector3 offset = Position - sourcePosition;
+            if (offset.LengthSquared() > 0.001f) {
+                targetRecord.Direction = Vector3.Normalize(offset);
+            } else if (damage.Direction.LengthSquared() > 0.001f) {
+                targetRecord.Direction = Vector3.Normalize(damage.Direction);
+            }
+        }
         damage.Targets.TryAdd(ObjectId, targetRecord);
 
         if (attack.Damage.Count <= 0) {

Maple2.Server.Game/Model/Field/Entity/FieldSkill.cs

@@ -112,12 +112,13 @@ public override void Update(long tickCount) {
                 SkillMetadataAttack attack = record.Attack;
                 record.TargetUid++;
                 var damage = new DamageRecord(record.Metadata, attack) {
-                    CasterId = Caster.ObjectId,
+                    CasterId = ObjectId,
                     OwnerId = ObjectId,
                     SkillId = Value.Id,
                     Level = Value.Level,
                     MotionPoint = record.MotionPoint,
                     AttackPoint = record.AttackPoint,
+                    Position = Position,
                     Direction = Rotation,
                 };
                 var targetRecords = new List<TargetRecord>();

Maple2.Server.Game/Packets/RegionSkillPacket.cs

@@ -17,7 +17,7 @@ public static ByteWriter Add(FieldSkill fieldSkill) {
         var pWriter = Packet.Of(SendOp.RegionSkill);
         pWriter.Write<Command>(Command.Add);
         pWriter.WriteInt(fieldSkill.ObjectId);
-        pWriter.WriteInt(fieldSkill.Caster.ObjectId);
+        pWriter.WriteInt(fieldSkill.ObjectId);
         pWriter.WriteInt(fieldSkill.NextTick.Truncate32());
         pWriter.WriteByte((byte) fieldSkill.Points.Length);
         foreach (Vector3 point in fieldSkill.Points) {