On the UEG vs Touichirou fight, not only UEG destroyed several universes but also higher-level space-time continumms that resides above the conceptual multiverse:
"UEG calmly appeared behind Touichiro.
Since they could come to this place from a totally different world to begin with, it was only natural that both of them could freely move to another universe as they wish.
It was then that the chain of even greater tragedies began.
In short, first, both of them traveled in the space between the universes, and immediately wiped out the ones they predicted their opponent would go to.
Then, one of them moved beyond the bounds of the multiverse that contained the universe accommodating their opponent, and launched their attack at the universe from there.
In response to that, the other party moved to an even higher-level space-time continuum than the one their opponent was in to strike back. Basically, this way of destruction continued endlessly, before the battle suddenly came to a halt. Touichiro's attack had finally managed to annihilate the space-time continuum that contained UEG".