Body Spikes

These are short blades fitted to a humanoid's armor. An opponent who grabs, grapples, or wrestles with a humanoid wearing body spikes from the spikes each round. Body spikes can be used aggressively if the wearer runs at his opponent. The damage inflicted by body spikes depends on the size of the wearer: T/S = 1d2, M =1d3, L = 1d4. The spikes are permanently fitted to the armor and cannot be retracted. Spiked armor costs 150% of the normal armor cost.

[Complete Book of Humanoids]