Omen

Omen, Blade of the Black Terrace is an Ultra-tier Tormentor and the final boss of the Deep Dive activity from Season of the Deep. It lives in the Drowned Pyramid and is used by Xivu Arath to test Guardians. Omen resists damage until the Guardians kill three hidden Honed Minotaurs to gain the "Deathly Sharp" buff (45 seconds of normal damage), repeating until Omen dies. Defeating it in a timed run completes the Wicked Implement Exotic Quest.