Iron Heart is a mechanics in Benighted Soul, a mod for The Binding of Isaac.

Protects Isaac from taking non-self damage
(Loss and invincible time are related to the damage type).
Cannot prevent Isaac from dying.

To other characters:
• Will be cleared next level.
• Fixed 28 maximum.

To Benighted Magdalene:
• Permanent duration.
• Maximum range [14, 70].
• When gained from some other effects, the part over the maximum will be saved until the next room.
• Tiggers hurt effects and lose 2 maximum for every 7 loss.
• Recovers 1 maximum when clearing a room. ^IRecovers 0.5 maximum when clearing a greed wave.
• Causes 1 heart extra damage when taking over-damage.

• Download Benighted Soul from the Steam Workshop.