Axespike( Races of Stone, p. 137)
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.
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 1/2 your Strength modifier to the damage from this extra attack, as if it were an attack with an off-hand weapon.