diff --git a/src/NosCore.Packets/ServerPackets/Map/EffObPacket.cs b/src/NosCore.Packets/ServerPackets/Map/EffObPacket.cs
index d1264289..41c48277 100644
--- a/src/NosCore.Packets/ServerPackets/Map/EffObPacket.cs
+++ b/src/NosCore.Packets/ServerPackets/Map/EffObPacket.cs
@@ -1,24 +1,23 @@
 using NosCore.Packets.Attributes;
 using NosCore.Packets.Enumerations;
+using NosCore.Shared.Enumerations;
 
 namespace NosCore.Packets.ServerPackets.Map
 {
     [PacketHeader("eff_ob", Scope.InGame)]
     public class EffObPacket : PacketBase
     {
+        // The client reads only the FIRST CHARACTER of this field.
         [PacketIndex(0)]
-        public string ExtraSpace { get; set; } = string.Empty;
+        public VisualType VisualType { get; set; }
 
         [PacketIndex(1)]
-        public short MapX { get; set; }
+        public long VisualId { get; set; }
 
         [PacketIndex(2)]
-        public short MapY { get; set; }
+        public bool IsVisible { get; set; }
 
         [PacketIndex(3)]
-        public byte Unknown { get; set; } //TODO to find
-
-        [PacketIndex(4)]
         public int EffectId { get; set; }
     }
 }
diff --git a/test/NosCore.Packets.Tests/SerializerCorpusTests.ExpressionTreeSerializerOutputIsPinnedForEveryPacket.verified.txt b/test/NosCore.Packets.Tests/SerializerCorpusTests.ExpressionTreeSerializerOutputIsPinnedForEveryPacket.verified.txt
index a1671443..3f04ddb7 100644
--- a/test/NosCore.Packets.Tests/SerializerCorpusTests.ExpressionTreeSerializerOutputIsPinnedForEveryPacket.verified.txt
+++ b/test/NosCore.Packets.Tests/SerializerCorpusTests.ExpressionTreeSerializerOutputIsPinnedForEveryPacket.verified.txt
@@ -518,8 +518,8 @@ Bgm2Packet#1 => bgm2 21
 Bgm2Packet#7 => bgm2 74
 BgmPacket#1 => bgm 21
 BgmPacket#7 => bgm 74
-EffObPacket#1 => eff_ob s15521 44 83 53 21
-EffObPacket#7 => eff_ob s15674 75 77 8 43
+EffObPacket#1 => eff_ob 1 44 0 53
+EffObPacket#7 => eff_ob 9 75 0 8
 EffTPacket#1 => eff_t 1 44 83 53 21
 EffTPacket#7 => eff_t 9 75 77 8 43
 GroundEffectPacket#1 => eff_g s15521 44 s12383 53 21 1
diff --git a/test/NosCore.Packets.Tests/SerializerTest.cs b/test/NosCore.Packets.Tests/SerializerTest.cs
index 805efb77..b9f05035 100644
--- a/test/NosCore.Packets.Tests/SerializerTest.cs
+++ b/test/NosCore.Packets.Tests/SerializerTest.cs
@@ -1054,13 +1054,15 @@ public void SerializeEffObPacketMatchesTrace()
         {
             var p = new EffObPacket
             {
-                ExtraSpace = string.Empty,
-                MapX = -1,
-                MapY = -1,
-                Unknown = 0,
-                EffectId = 4269
+                VisualType = VisualType.Player,
+                VisualId = 2,
+                IsVisible = true,
+                EffectId = 4430
             };
-            Assert.AreEqual("eff_ob  -1 -1 0 4269", Serializer.Serialize(p));
+            Assert.AreEqual("eff_ob 1 2 1 4430", Serializer.Serialize(p));
+
+            p.IsVisible = false;
+            Assert.AreEqual("eff_ob 1 2 0 4430", Serializer.Serialize(p));
         }
 
         [TestMethod]