THE FACT ABOUT ISAAC LIBERTY CAP THAT NO ONE IS SUGGESTING

Ending 20, identified as "Closing Ending" before The Binding of Isaac: Repentance, is unlocked just after defeating the boss Delirium, who's Isaac's illustration of the "light at the end of the tunnel".[16] It builds on functions observed in Endings 12, 15, and seventeen, and exhibits Isaac recalling his memories in his closing times prior to dying