Axiomatic creatures may also be fiendish or celestial, but a fair number of them occupy the pure realms of regimented order in the outer planes.
CR: No change until 5 HD, CR +1 at 5 HD or more.
Senses: Darkvision: Gains the ability to see in the dark up to 60 feet.
Spell Resistance: Gains SR equal to new CR +5.
Smite Chaos: Smite Chaos 1/day as a swift action (add Cha bonus to attack rolls and damage bonus equal to HD against one chaotic foe; smite persists until target is dead or the axiomatic creature rests.)