Rhea, otherwise known as Seiros or the immaculate one, is a character in Fire Emblem: Three Houses, and a Nabatean- dragon in guise of a human and children of the goddess- acting as the archbishop of the church before the devastation of Byleth's betrayal made her go mad. I am...Rhea... Archbishop of... the Church of Seiros.. please, leave my presence... before I.... I... Graaah!