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The main RuneScape Wiki has an article on: Sinister key
The Old School RuneScape Wiki also has an article on Sinister key.

The Sinister key is used to unlock the chest found in the Yanille Agility dungeon. Other than by trading other players, Salarin the Twisted drops this key at a 1/13 chance and is the only way to obtain one. Upon using the key on the chest, the key disappears.

Unlocking the chest with the Sinister key rewards the player with 9 Herbs which when identified are the following:

From identifying and making all the best potions possible with these herbs, you will gain 1000.5 Herblaw experience.

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