Well, I cannot say there is a correlation between summoning creatures and this issue, but considering that my output_log is over 1gb with mostly following error logged, there could be something there
NullReferenceException
at (wrapper managed-to-native) UnityEngine.Component:get_gameObject ()
at Game.StatusEffectManager.HandleOnCharacterDestroyed (UnityEngine.GameObject character) [0x00000] in <filename unknown>:0
at Onyx.OnyxEvent`1[unityEngine.GameObject].Trigger (UnityEngine.GameObject arg1) [0x00000] in <filename unknown>:0
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
Game.UIDebug:DisplayOnScreenWarning(OnScreenWarning, Single)
Game.UIDebug:LogOnScreenException(Exception, Department, Single)
Onyx.OnyxEvent`1:Trigger(GameObject)
Game.CharacterObjectManager:DestroyCharacter(GameObject)
Game.CharacterObjectManager:DestroyCharacter(GameObject, Single)
Game.Health:Unsummon()
Game.AIController:KillSummonedCreatures(Boolean)
Game.AIController:OnyxDisable()
Onyx.OnyxBehavior:OnDisable()