Ending 20, called "Final Ending" ahead of The Binding of Isaac: Repentance, is unlocked immediately after defeating the boss Delirium, that's Isaac's representation of the "gentle at the end of the tunnel".[sixteen] It builds upon events found in Endings 12, 15, and seventeen, and displays Isaac recalling his Reminiscences in https://liberty-cap-binding-of-is53073.blogdosaga.com/28436389/everything-about-liberty-cap-the-binding-of-isaac