Omnigul, Will of Crota
Omnigul, Will of Crota is a Hive Wizard working for the Hive god Crota. She is the mother of the Spawn of Crota (likely making her Crota's consort), and is encountered multiple times by the player in The Dark Below. She is the secondary antagonist for the expansion.
Twice, the player foils Omnigul's plans, yet she escapes. The first time is in Fist of Crota, where she's encountered during a battle between Hive and Fallen. The second time is during Siege of the Warmind, where the player foils her attempt to seize control of Rasputin. Omnigul is finally killed in the strike Will of Crota when she's cornered in the Jovian Complex.
Omnigul is the only wizard with an Arc shield, rather than a Solar shield like most wizards. She also can summon Hive and casts poison with greater frequency. Unlike normal wizards, Omnigul fires her darkness blasts faster and more accurately than normal. Also, unlike any other Ultra class enemies, she can be blinded by flashbang grenades, Ward of Dawn with the Helm of Saint-14 equipped, and the Purifier Robes.