diff --git a/src/GameLogic/CharacterExtensions.cs b/src/GameLogic/CharacterExtensions.cs
index d4fe91500..8eb5706ea 100644
--- a/src/GameLogic/CharacterExtensions.cs
+++ b/src/GameLogic/CharacterExtensions.cs
@@ -52,9 +52,17 @@ public static bool HasFullAncientSetEquipped(this Character character)
                 i.ItemSlot <= InventoryConstants.LastEquippableItemSlotIndex
                 && i.ItemSlot >= InventoryConstants.FirstEquippableItemSlotIndex
                 && i.ItemSetGroups.Any(group => group.AncientSetDiscriminator > 0))
-            .Select(i => new { Item = i.Definition, Set = i.ItemSetGroups.First(s => s.AncientSetDiscriminator > 0) });
-        var ancientSets = equippedAncientSetItems.Select(i => i.Set).Distinct();
-        return ancientSets.Any(set => set.ItemSetGroup?.Items.All(setItem => equippedAncientSetItems.Any(i => i.Item == setItem.ItemDefinition && i.Set == set)) ?? false);
+            .Select(i =>
+                new
+                {
+                    Item = i.Definition,
+                    Set = i.ItemSetGroups.First(s => s.AncientSetDiscriminator > 0),
+                });
+        var ancientSets = equippedAncientSetItems.Select(i => i.Set.ItemSetGroup).WhereNotNull().Distinct();
+        return ancientSets.Any(set =>
+            set.Items.All(setItem => equippedAncientSetItems.Any(i =>
+                object.Equals(i.Item, setItem.ItemDefinition)
+                && object.Equals(i.Set.ItemSetGroup, set))));
     }
 
     /// <summary>
diff --git a/src/GameLogic/ItemExtensions.cs b/src/GameLogic/ItemExtensions.cs
index 6a6f63441..5a92fc5c2 100644
--- a/src/GameLogic/ItemExtensions.cs
+++ b/src/GameLogic/ItemExtensions.cs
@@ -87,7 +87,7 @@ public static byte GetMaximumDurabilityOfOnePiece(this Item item)
     /// </returns>
     public static bool IsAncient(this Item item)
     {
-        return item.ItemOptions.Any(link => link.ItemOption?.OptionType == ItemOptionTypes.AncientBonus);
+        return item.ItemSetGroups.Any(itemSet => itemSet.AncientSetDiscriminator > 0);
     }
 
     /// <summary>
@@ -305,6 +305,13 @@ public static ItemAppearance GetAppearance(this Item item)
             .Select(option => option.ItemOption!.OptionType!)
             .Distinct()
             .ForEach(appearance.VisibleOptions.Add);
+        if (item.IsAncient())
+        {
+            // 1. The ancient option is not included in the item.ItemOptions.
+            // 2. The bonus option is not always existing for ancient items. And it's not marked as visible.
+            // -> we check it based on the item set group.
+            appearance.VisibleOptions.Add(ItemOptionTypes.AncientOption);
+        }
         return appearance;
     }