I think this makes for a pretty complex one to puzzle out.
All the MCU Eternals are fused into a single being with all of their abilities. Please note: This is not a stacked composite. I don't know if MCU Eternals have a Uni-mind but any Uni-mind is disallowed.
All fights take place in a deserted Feudal Japan. The so-called Big Eternal will begin in the old capital of Edo. Opponent(s) must be dropped within 1 mile of their position.
Who is the strongest person that the Big Eternal could defeat in combat?