A choice is offered: An afterlife of unending bliss, or a chance to return to mortal life. The offer could come from a god, an angel, or the spirit of a deceased love one. Often, it comes at the end of the hero's journey, or during a Near Death Experience towards the climax.
There are many reasons why this offer might be refused. Perhaps the character has Unfinished Business. Perhaps he feels [...] [tvtropes.org]