You have mastered the art of fighting in spiked armor while wielding a greataxe. You blend greataxe blows and armor spike attacks into one constant, deadly attack form.
Prerequisites: Proficiency with armor spikes, proficiency with greataxe, Armor Proficiency (heavy), Weapon Focus (armor spikes).
Benefit: When you make a full attack with your greataxe, you can make an additional attack with your armor spikes at a –5 penalty. You can only add ½ your Strength modifier to the damage from this extra attack, as if it were an attack with an off-hand weapon.
Source: Races of Stone, page 137.