Batman sucks all of their souls and stores them in handy dandy vials. Then Superman 1 Million eats all of said vials. Then, Batman steals his soul, which now has melded with the other souls. This double soul removal maneuver destroys the other heroes completely.
batman
And for serious, Shuma eats all of em.
Genis Vell blast all of them into oblivion.
Batman can take their souls?
Genis can see what Bat is going to do before Bat can even think it.
Genis will just phase out of reality the whole JLA, or freeze them and then kill them with his energy blasts.
The guy is on skyfather level, he beat down King Thor and a frost giant like it was a pet.