Another mob in the Protector's Realm Instance, triggered by hailing the mob after you have spoken to the NPCs in Doomcoils room, have someone trigger this mob before you fight it.

Mob has 2 ^^^ Skeleton Adds, all mobs are skeleton types so Strikes work.

Every 40s or so Mob will cast Touch of the faceless, does between 8-18k dmg, might wanna stack your tank or intercept during this period.