You grow horns like your minotaur ancestor.
Prerequisites
Monstrous Bloodline (Minotaur).
Benefit
You gain the Great Horns mutation, sprouting a pair of bull horns that deal piercing damage.
In addition, you gain the powerful charge special ability, on a charge, your gore damage increases to 2d6 (assuming you are Medium size) + the number of Monstrous Blood feats you possess.
Special
If you are not medium size, you double the base damage dice of your gore attack to determine the damage you do on a charge but do not change any other modifiers to the damage.