I read a book called How to Become the Dark Lord and Die Trying.

There is a woman from Earth named Davi who is the chosen one and she is stuck in a time loop in a fantasy world. Every time she dies, she wakes up in a forest pond and an old wizard finds her and says the prophecy is for her to save the world.

She has lived 237 of these lifetimes, totaling over 1,000 years, and can never win. The dark lord and his horde always wins, no matter what she tries. She has understandably become quite cynical. Her personality is like Deadpool now; she takes nothing seriously, constantly jokes about things, and breaks the fourth wall.

So as she is getting tortured in the dungeon of the dark lord on life #237 after yet another multi-year attempt that failed, she decides she is fed up with this. Instead of trying to defeat the dark lord and save the kingdom, she will instead join the bad side and become the dark lord.

So after finally finding a way to kill herself and end the torture, she wakes up in the forest pond again. When the wizard comes to find her, she kills him and then heads into the forest to start her journey to work up the bad guys ladder. Kind of like Groundhog Day she has so much accumulated experience (fighting, magic, combat tactics, knowledge of what events will happen when) and she can iterate when she fails, so she sets off on this new journey to become Dark Lord Davi.

So the story follows her as she builds a bigger and bigger army (she insists on calling it a horde, since dark lords have hordes) and adventures across the world accumulating power.

Funny stuff.