gugalanna can cause multi-year droughts, massive hurricanes, can singlehoovedly destroy at least smaller singularities and nations etc. considering the sumerian gods had trouble controlling it and mostly were just able to unleash it it's pretty impressive as far as divine beasts go, even in a franchise where supposedly impressive monsters are always dogshit compared to servants. presumably if ishtar was directing it she could tell it not to start a hurricane and spray mud everywhere and rather zap tiamat with lightning, physically wrestle her and evaporate the chaos tide with drought.