diff --git a/src/Engine/Objects/MonsterEnums.h b/src/Engine/Objects/MonsterEnums.h
index cb752ceab7eb..4718275521aa 100644
--- a/src/Engine/Objects/MonsterEnums.h
+++ b/src/Engine/Objects/MonsterEnums.h
@@ -490,7 +490,7 @@ enum class MONSTER_SUPERTYPE {
     MONSTER_SUPERTYPE_WATER_ELEMENTAL = 0x5,
     MONSTER_SUPERTYPE_TREANT = 0x6,
     MONSTER_SUPERTYPE_TITAN = 0x7,
-    MONSTER_SUPERTYPE_8 = 0x8, // TODO(captainurist): not an arena monster? Drop?
+    MONSTER_SUPERTYPE_NOT_ARENA = 0x8, // Can't be spawned in Arena, no MM7 monster belongs to this supertype.
 };
 using enum MONSTER_SUPERTYPE;
 
diff --git a/src/GUI/UI/NPCTopics.cpp b/src/GUI/UI/NPCTopics.cpp
index 3f03dcb28392..22243a642e95 100644
--- a/src/GUI/UI/NPCTopics.cpp
+++ b/src/GUI/UI/NPCTopics.cpp
@@ -326,7 +326,7 @@ void prepareArenaFight(DIALOGUE_TYPE dialogue) {
     std::vector<MonsterId> candidateIds;
     for (MonsterId i : allArenaMonsters()) {
         if (pMonsterStats->pInfos[i].uAIType != MONSTER_AI_WIMP) {
-            if (supertypeForMonsterId(pMonsterStats->pInfos[i].uID) != MONSTER_SUPERTYPE_8) {
+            if (supertypeForMonsterId(pMonsterStats->pInfos[i].uID) != MONSTER_SUPERTYPE_NOT_ARENA) {
                 if (pMonsterStats->pInfos[i].uLevel >= monsterMinLevel &&
                     pMonsterStats->pInfos[i].uLevel <= monsterMaxLevel) {
                     candidateIds.push_back(i);