History of Thumos, the Unbroken

Thumos, the Unbroken is a Red Legion commander, one of Dominus Ghaul's Chosen, and is believed to lead the Blood Guard. He is the final boss of the story mission Unbroken, which takes place aboard the Cabal carrier Orobas Vectura in the Sunken Isles. Thumos is escorted by two Blood Guards, and after he loses a third of his health, Cabal reinforcements arrive.

The Guardian takes the keycodes to Thumos's personal shuttle from the ship. Those codes are used in the next missions, Larceny and 1AU, to infiltrate The Almighty.