Bone spike protrusion is the ability to produce a mass of bone spikes that protrude outward from the user's body.
- Perrin Crocker has demonstrated this ability.
- Kimimaro (Naruto) has equally demonstrated this ability going as far as making his ribs protrude from his chest.
Perrin is capable of creating bone spikes that appear to protrude from his body. While enraged, he is seen unintentionally using his ability to pierce through multiple victims within his close proximity. Perrin suggests that he used his ability when unsconscious to unwillingly stab and kill his wife. Since he stated that no murder weapon was found regarding his wife, his unconscious spike retracted. Whether he can consciously retract them is yet to be determined.
The spikes are strong enough to penetrate bodies and have penetrated the top of a prison transport bus.