Brawler

Guardian

Level 10: Your unarmed attacks deal an additional 1d6+1/level physical damage

Level 15: Your limbs have become increasingly durable, causing you to gain +3 Defense while unarmed.

Level 20: Your are uninhibited in your swings, the force causing the very air to move aside so as to let your fists fly faster. One additional unarmed attack per full round attack while not wielding a weapon.