When worn, it completely blocks one instance of damage every 5 seconds and has 16 uses. If the wearer takes damage when the shield is not active the wearer will take full damage. Nightmare Fuel can be used to repair 4 uses, or 25% of its durability. It will not disappear when its durability reaches 0. Instead, it stays at body equipment slot, but has no effect until it is refueled.
- Bone Armor was introduced in the Hearts of the Ruins update.