IV - The Emperor?
CardRepentanceLocked
How do you unlock IV - The Emperor??
In The Binding of Isaac, IV - The Emperor? is unlocked by earning the Ultra Greedier completion mark as Tainted ??? on hard mode.
Structured pathSource-backed requirements are mapped into trackable steps.
Teleports Isaac into an extra Boss Room from the boss pool two floors deeper than the current floor (but never a final boss). The boss will drop a reward. Exiting the room returns Isaac to where he used the card.
What unlocking IV - The Emperor? leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13