Nergal

Nergal is the main antagonist of Fire Emblem and is the only character that belongs to the Dark Druid class and wields the strongest dark magic tome in the game; Ereshkigal. He is responsible for the golden-eyed morphs (i.e. Sonia, Linstella, Ephidel) that travel the world looking for the quintessence of powerful individuals to give him even greater strengh to call dragons through Dragon's Gate where he holds Ninian, Nils, and Eliwood's father early in the story. He stirs war in Lycia by controlling an assassin group called the Black Fang through his morph Sonia. Nergal was the one who called Ninian and Nils through Dragon's Gate a few hundred years after he and Athos discover the dragon world of Archades where dragons and humans lived peacefully. In the last chapter of the game, Nergal finally uncovers his face from the turban that hides it to reveal a wound along his forehead and his right eye that he says Athos is responsible for. After Ninian is accidentally killed by Durandal through Eliwood, it is her quintessence that actaully opens Dragon's Gate which he eventually calls three fire dragons through before dying, but after being defeated.