Quills

The character has quills, like those of a porcupine, all over his body. The player can instead choose to have ridges of spines along his back, arms, legs, and tail (if he has one).
Type: Minor positive.
Effect: The character has 10 small, pressurized air sacs at various locations on his body that allow him to fire a group of quills like darts. Firing a batch of quill counts as an attack action (using one attack roll). Each batch of quills does 1d4 + Strength modifier piercing damage. The attack has a range increment of 10 feet. The character can do this 10 times before the air sacs need to replenish their supply of quills. They replenish at a rate of 1 per hour.
Anyone who attempts to grapple the character takes 1d4 points of piercing damage, whether the grapple is successful or not. This damage is only taken when initiating the grapple, not when maintaining.
Biotech: Graft.