Sir Skullduggery

Overview

Sir Skullduggery is a Headless One of uncertain loyalty who appears in Haunted Altars of Sorrow during the 2025 Festival of the Lost. The fireteam summons him by holding a plate in the summoning circle.

Fight

Players bank treats from Greedy Ghouls with him until they reach 80, then a Shrieker and a Devoured Ogre in an immunity shield appear. Invoking Hive Magic over the circle turns the Shrieker to the team's side, and it removes the ogre's shield. Bungie's Update 9.1.5.4 (November 2025) fixed a counter bug on the altars, and a softlock in the final encounter was reported with a workaround.