Hydra was a Grand Inquisitor in the Inquisitorius during the early years of the Galactic Empire. She replaced Malorum as Grand Inquisitor after his death in 18 BBY. She had a business relationship with Sano Sauro, which the former Senator commented on in a conversation with Bog Divinian, the Imperial Governor of Samaria. Later, Hydra was sent with Ferus Olin to Alderaan in search of a Force-sensitive child. She was known for having hardly any emotion.
- The Last of the Jedi: Secret Weapon (First mentioned)
- The Last of the Jedi: Against the Empire (First appearance)
- The Last of the Jedi: Master of Deception
- The Last of the Jedi: Reckoning
- The Complete Star Wars Encyclopedia
- Star Wars: The Official Starships & Vehicles Collection 29 (Indirect mention only)
- The Essential Reader's Companion