Blood of the Martyr is a passive item.
A halo covered with thorns.
Increases Damage by 1 and turns Isaac's tears into blood tears, even if the damage stat doesn't pass 5.5. Also changes the effect of The Book of Belial and XV The Devil tarot card from +2 damage to +2 damage and then damage x1.5 (as long as Max's Head or the Magic Mushroom hasn't been picked up).
- This spiked halo resembles the crown of thorns that Jesus Christ wore when he was crucified.
- A martyr is a person sacrificed because of their beliefs.