The halo array could do it, assuming he wouldn't have time to blow up all the rings or know what they could do. Any other ideas on killing someone who absorbs supernovas?
Sugeestions:
Anti-monitor
Doomsday for a draw
Batman with prep time
The flood
Anti matter?
Shazam
Etc
Wow, superman is not as strong as a thought! By that, I mean there are many ways he can be defeated by various fictional universes. He's still strong as a fricking black hole.
Note that not all of these options are a guarentee. I'm only taking goku off because I remember the deathbattle from youtube.
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Can't he drown?