As soon as you start using "omni" you start having problems.

*Create something you can't destroy*

Or in this case

*Create something the other guy can't destroy*

Which of them isn't omnipotent, the one who can't create such an item or the one who can't destroy it? *Either way, one of them is no longer omnipotent.*


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The old pantheons had a way round this problem, while they had limits to their powers they also had rules to obey, including:

>no god may undo what another god has done - [Ovid, Metamorphoses](https://archive.org/stream/metamorphoses01ovid/metamorphoses01ovid_djvu.txt)

Which meant that if one god had created it, whether the other could destroy it or not was irrelevant, they wouldn't be allowed to try.