You have learned to attack with your horns in combat.

Prerequisite: Asterion, Con 13, BAB +1.

Benefit: You are able to make attacks with your horns as a natural primary attack, or as a natural secondary attack if you are armed with manufactured weapons.  Your horn attacks deal a base 1d4 piercing damage. You suffer a –1 penalty to AC on any round you make an attack with your horns.