Onslaught vs Cul Borson

Cul is at his power level at the end of Fear Itself, with the whole scared

Onslaught is at his power level with Franklin Richards and Nate Grey absorbed

No prep

One on One

Fight to the death

Location is Manhattan

Cul has his hammer (duh)

Both are sufficiently pissed that the other is standing there unafraid

Who wins?

in my opinion, serpent would win this. mainly cause so many characters on mephisto's level were scared of him for a reason.