Anos Voldigoad is the Demon King Of Tyranny, he can do many magical things, but his main thing is that he can destroy basically everything, even abstract things like logic, destiny and Orders (the Orders are the laws which define and govern the universe, basically rules of how reality works) and his source (something deeper than the body, the mind and the soul, basically his true existence) is beyond, maybe superior, and so immune to any Order and it's made of death, destruction etc.