An engineering genius of undeniable prowess, Millificent Manastorm seems to be the complete opposite of her husband Millhouse. Smart and resourceful, she is a force to be reckoned with.
Blood-Princess Thal'ena is the daughter of the powerful vampyr Queen Lanathel. She has been locked inside Violet Hold for years, suffering the gnawing pain of her eternal hunger. Now that her cell has opened, she intends to feed on the world.
In Heroic difficulty, Blood-Princess Thal'ena uses Blood Call to summon a Congealed Blood from a blood pool. If the Congealed Blood reaches the princess, it does damage to the party and heals the boss. Those effected by Essence of the Blood Princess can instantly kill a Congealed Blood by running through it.
Professor Putricide had many experiments seized when Icecrown Citadel fell. At best guess, Festerface appears to be a prototype for two more fearsome constructs; Rotface and Festergut.
In Heroic difficulty, each Congealed Goo that is consumed grants Festerface 20 energy. Festerface slowly loses his accumulated energy over time.
Anub'esset, one of the few remaining ancient Nerubian crypt lords, was captured by the Kirin Tor during the invasion of Icecrown Citadel and imprisoned in Violet Hold. Set free during the Legion's invasion, his thoughts turn only to revenge against the living.