Curse of the Peverells

Icarus Peverell, son of Ignotus Peverell, died in the great purge of the dark ages. In desperation, his father cursed his own family line. Should there ever be a son born from the union with a muggleborn his soul would be sacrificed to let his own son live once more. Centuries past, the long line of necromancers turned into a long line of warders, curse long forgotten.