I am pretty sure I asked for a central authority figure and just used those two because everyone knows what they are. I could've used the deities of TES, the Precursors from Halo or the Soul King from Bleach. Message is the same: who's the "person of last resort" not just to Earth or a peculiar world but to the entirety of the Nasuverse.
That's more "collective unconscious" than what I am asking for, which is essentially "I do what I want, to who I want and whenever/wherever I want, and no one ever denies me, for better or for worse because guess what? I am supreme lord of this freaking universe/multiverse/all timelines. Nothing is beyond me!"
That kind of thing.
I just want to know who's the guy in charge around this place.
Because I never mentioned they had to be the entity that messed with stuff! I know that's actually a thing the freaking Living Tribunal does. The issue is that there always has to be a power cap that cannot be exceeded, a kind of "power level ceiling" that's not relative and upon which everything else can be measured against.
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They could be "somebodies" as well, but they need to be able to do this sort of shit consciously. I kind of like putting a face to the nearest source of cosmic force in a setting. I could've also asked "which is the most powerful entity in the Nasuverse, the one all the known characters working together couldn't defeat and said entity(ies) could wipe out with a mere thought?"
I would've thought it was Shiki, but the fact they mentioned a Servant would off her mid dif is not exactly telling. Tiamat was restrained, so that's a no as well. This needs to be an entity that, in a theoretical fight, cannot be challenged. Even if said entity does nothing except watch from gods know where.