XIX - The Sun?
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How do you unlock XIX - The Sun??
In The Binding of Isaac, XIX - The Sun? is unlocked by earning the Ultra Greedier completion mark as Tainted Jacob on hard mode.
Structured pathSource-backed requirements are mapped into trackable steps.
Gain Spirit of the Night and +1.5 Damage for the current floor. Turns Isaac's Red Heart into Bone Hearts, but they revert once the effect ends. Also causes Darkness that cannot be dispelled.
What unlocking XIX - The Sun? leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13