Dusk

The Guardian of Dusk, along with the Guardian of Dawn, are the Grotesque Guardians which require level 75 Slayer to kill. It is the boss version of the gargoyle, found on the Slayer Tower's rooftop. In order to access the roof, players must obtain a brittle key from gargoyles while assigned them for a slayer task. Similar to other slayer bosses such as Cerberus and the Abyssal Sire, the Grotesque Guardians can only be killed while the player is assigned gargoyles as a slayer task.

To initiate the fight, players must ring the Cloister Bell in the north side of the roof. This will trigger a cutscene in which the Guardians will awaken, and the fight will begin.