Ending 20, termed "Final Ending" prior to The Binding of Isaac: Repentance, is unlocked after defeating the boss Delirium, that is Isaac's representation of the "light-weight at the conclusion of the tunnel".[sixteen] It builds upon functions observed in Endings twelve, 15, and seventeen, and demonstrates Isaac recalling his memories in https://cashvkxjt.techionblog.com/28562174/about-liberty-cap-the-binding-of-isaac