Grants a Soul Heart. Gives Isaac a chance to ignore any damage taken.
Quote
"Hard headed!"
Effects
Grants +1 Soul Heart.
Any damage dealt to Isaac has a 20% chance to be ignored.
These include damage through tears, contact, explosions, cursed doors, Blood Donation Machines, and Demon Beggars.
Contact damage with enemies is difficult to avoid as the damage negation does not provide invincibility frames.
Isaac flashes briefly blue when damage is negated. The flash can occur even while invincible from taking a hit or using an invincibility effect.
Synergies
Razor Blade - Has a chance to block the damage inflicted by Razor Blade, but the damage up from it still applies, allowing you to stack more damage than usual.