This "depression from calculating the end of the universe" thing is a dumb meme. If you're working with enough mental power to actually mentally prove mathematically and internalize the results, you're already smart enough to start working on the obvious solution of a universe-hopping arc, as there isn't actually anything in the laws of physics that prevents you from doing this. And it's extra dumb here because not only is there magic to supplement traditional tech, but also literal proof it can be done.