Abraxas would take it IMO. He was a multiversal threat against a universal threat like imperious.
__________________ Quotes from Hia8:
"I claimed that the science is sometimes faulty."
"You don't understand. This is fiction. That means none of this stuff really happened."
"There is no writer to purposely ignore a character's natural ability just because it suits the story."
"in some cases because the writer knows that Character A will dominate Character B easily and refuses to allow this to happen for the sake of the story."
Abraxas was a fishy character, for all his supposed power he seemed underwhelming. He supposedly killed alternate universe Galacti but we don't know what state of hunger they were in or how they compare in power to 616 Galactus. What we do know is that as soon as Val and Frank rezzed Galactus, Abraxas threatened them with the UN which Galactus then stole from him. Then he panicked.
I'm going with Imperiex Prime.
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
From what I know, 616 Galactus is now referred to as the Galactus Prime of the Prime Reality 616 because of the Abraxas saga.He's feeding off of planets was not only to satisfy his hunger.It was revealed that some of the energies that 616 Galactus gets from eating planets goes to the bonds that keeps Abraxas inside Multi-Eternity.And when 616 Galactus died, Abraxas was free to destroy the Multiverse.Even Multi-Eternity was helpless to stop him.I at least remember Dormammu usurping and using Multi-Eternity's power to destroy and recreate the entire Marvel Multiverse to a single Universe called the "Dormammuverse". So in terms of power, Abraxas>Multi-Eternity>Galacti.Abraxas only got owned because of the plot device known as the UN.
A theory can be said that 616 Galactus was only able to pull it off because when Val and Frank revived him, Big G might have been at full power.Not to mention Big G stated that the UN is part of him.Imperiex Prime doesn't have the UN.So he's basically screwed against Abraxas.
But the fact remains we DON'T know how powerful those alt reality Galacti were or what state of hunger they were in. No one on this board would accept a feat from what's basically a What If dimension (aka alternate reality). So I'm not buying it.
Secondly, if he could really destroy all the multiverse under his own power, why did he seek out the UN? Why couldn't he kill 616 Galactus under his own power, why did he have to resort to thratening him with the UN?
And Roma is a joke, Adversary owned that skank (the same guy FORGE fought to a standstill). I'm still going with Imperiex Prime.
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.