I love the class but a word seems to appear I don't get.

What is UP?
UP: You return to full hit points, and are cured of the following conditions: deaf, shaken, dazzled, fatigued, disease. At 13th level, you are cured of poison, blindness, stun, exhaustion, frightening. At 16th level, you are cured of daze, any ability damage, panic, confusion, polymorph. You can unleash this ability even if there is an adverse condition (such as stunning) that would restrict you from acting.