From the publisher:
What happens when you cross the lawlessness of the Elemental Chaos with the madness of the Far Realm? You get the philosophical xax! The new xax 4E PC race introduces a random and alien element to the game, without diminishing power. Standing under 4 feet tall, these very odd looking creatures appear more like hideous monster than friendly ally. However, they are truly benevolent and intellectual beings that preach tolerance, acceptance, and the oneness of the universe. Still, it would be wise not to cross these great thinkers, as the blood of anarchy and insanity still runs hot in their veins. One never knows quite what to expect from a xax; one moment they are breathing fire, the next they may vanish entirely! Even the xax may be surprised. Add a little unpredictability to you game.