The solution to defeating imperiex was to take him to the big bang and have the very energies of creation explode... Taking his essence and spreading it across the cosmos...
Swamp thing can do that?
__________________ 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."
^ that's how you destroy imperiex (there's a bit more to it, though.)
but imperiex can be beaten by rupturing his armor, and letting his power/consciousness dissipate outward. granted he can reform, but that takes time -- long enough to constitute a forum win, at least.