Blaze Heart is a pickup in Heaven's Call, a mod for The Binding of Isaac.
Each held blaze heart spawns a Blazing Willo familiar that controls like its Abyss counterparts.
The Willos apply the burning debuff to enemies, dealing an extra 14 damage across 5 seconds.
On hit, Isaac will be protected from damage and the heart will break, removing the Willo and spawning between 6 and 12 fireballs that deal 12 damage.
Isaac can hold a maximum of 4 blaze hearts at a time.
Can be obtained from Wax Friends summoned by Retrograde Venus.
Can be obtained from Telescopes with a 3% chance.