The Voodoo Shaman

The Voodoo Shaman, real name Maleficum Storm/Heaven, is an Equestrian Satyr from the same evil family as The Storm King, and the younger brother of The Magic Master, which is the best magic user of the family. Jealous of his brother's notoriety, Voodoo Shaman wanted to be better than him and went to the Dark Arts of Voodoo to do so. His actions were unmentionable and treacherous, and thus he was exiled from the Storm Clan and had gone missing, prompting his brother to move on and honor him and the clan following it's collapse. Voodoo Shaman has actually been tapping into dark secrets to try and conquer Equestria before his brother can.