Undead - U

Umbryean = Umbyrean metal is a kind of metal forged from ectoplasm. It is one of the few known 'substances' capable of binding a Ghost or chaining it to a specific location. Umbryean metal is also used to create weapons and projectiles used by Ghosts and Resurrectionists to wound or incapacitate other Ghosts. 
Undead Pirates = Created by the Resurrectionists to ferry them across the world's oceans, these Undead Pirates are truly the scourge of the seven seas. For more info see Undead Pirates. 
Uriel = St. Uriel the Archangel is held to be the Angel of Death in mainstream Judeo-Christian Angelology. He is the Celestial patron of the entire Order of Resurrectionists and his favor is cultivated by many within the Order.