Ending 1 (Normal): Beat the final boss and sit at the bonfire. You will burn alive.

Ending 2 (Evil): Beat the final boss but just walk away after that. You will walk away.

Ending 3 (Tiny Worm A): Talk to Yurt the Heartless after killing Giant Demon of the Stinky Valley but make sure you do this BEFORE going receiving the Crystal Graves from Bethany of New York in The Undead Graveyard. IF YOU FAIL TO DO THIS YURT WILL BE DEAD THE NEXT TIME YOU SEE HIM. Get the Idiot Sigil from him and show it to the Stupid Fucking Follower of Chaos at the Shadow Temple to be admitted as a Stupid Fucking Follower of Chaos at the Shadow Temple. Invade 30 people. Exchange Evil Tongues to level up your allegiance and unlock Bethany of New York’s summon sign at the final boss. YOU MUST DO THIS BEFORE TRAVERSING THE WALKWAY OF SORROWS OR ELSE BETHANY WILL DIE AND HER SUMMON SIGN WILL BE UNAVAILABLE. If you manage to prove your allegiance but wish to revert progress you can kill the firekeeper and she will respawn with your covenant progress reset. Beat the final boss and a cutscene will play automatically. You will become a little tiny worm.

Ending 4 (Tiny Worm B): Get the Tiny Worm A ending, but attack Bethany of New York before the cutscene ends. You will become a little tiny worm.