The Return to Nothingness of Myriad Worlds

Any Stories Where the Main Character Is So Powerful, but It All Turns Out to Have Been a Dream?

The protagonist is really powerful at first, but it turns out to have all been a dream by the end.

A Protagonist Who’s Basically a Monster and Nearly Invincible

Looking for a Tearjerker with a Meaningful Theme, I Need a Good Cry

I've been playing too much Honkai lately, so it's time for a change of pace. Bring on both the big and small emotional gut-punches, preferably with a thematically meaningful ending.