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Box Maddison Jefferies of Alpha flight a Omega level mutant vs the Outsiders

Arsenal
Captain Boomerang
Nigthwing
Thunder
Grace
Starfire
Metamorpho
Huntress

Location is key here, where is the battle? The major threats are Starfire and Metamorpho.

lets say new york because its za big city and it exists in both the DC and Marvel universe

Well depending on how much time he has he could absorb all of New York, or set off nuclear explosions by destroying part of his mass as he has done before.

He did kill all of the mutants in North America after all (Weapon X: Days of Future Now)