How much stronger is evie than the setting characters

We seen one of them casually counter the greater red, but do you think that was power levels or say something more situational like a type advantage,

How much power leveling is needed to avoid setting being massacred.

I remember hearing the claim the servants were more powerful than great red. I mean the great red more powerful this Ophis who was infinite power, I am not sure I am understanding the power scaling or how the planet not going to blow up from Kiba fighting a mook.