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Brittle key detail

A brittle key is a key which grants the player access to the Slayer Tower's rooftop, where the Grotesque Guardians reside. It is used on the roof entrance on the top floor of the tower to access the rooftop.

It is only dropped by gargoyles when a player is assigned them for a slayer task.

Once players have unlocked the roof entrance, it can no longer be obtained.

Dropping monsters

Monster Combat level Quantity Rarity
Gargoyle 111 1 4; Rare (1/150)
Marble gargoyle 349 1 4; Rare (1/150)