Fel magic is a destructive form of magic often used by the members of the Burning Legion. It is demonic, entropic, chaotic and extremely volatile. Its use results in the alteration of the individual, or corruption, which manifests as a physical transformation such as a change to an individual's eyes or skin color, or heavy genetic mutations. All of the Burning Legion carry the taint of Fel magic within their very blood, allowing them to spread greater evil. Warlocks use life force to power their fel magic. Fel magic is the opposite of arcane magic and is chaotic and unpredictable, no study will allow you to fully tame fel and produce the same effect over and over again, fel does as it pleases. It can easily be said that you are as much its servant as it is yours to wield.