The Grotesque Guardians are gargoyle slayer bosses that reside at the top of the Slayer Tower. In order to access and fight them, the player must be assigned gargoyles as a slayer task or be assigned a Grotesque Guardians boss task. Prior to this, the player must also obtain a brittle key; a 1/150 drop from regular gargoyles and marble gargoyles which can only be obtained while assigned gargoyles as a slayer task.