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The sinister key is used to open the sinister chest in the Yanille Agility dungeon. The Sinister chest contains nine noted grimy herbs: 2 Harralander, 3 Ranarr, 1 Irit, 1 Avantoe, 1 Kwuarm, and 1 Torstol. The sinister key is dropped by Salarin the twisted and the Chaos Fanatic and can also be looted from a Magpie impling.

The value of the sinister key is linked to the value of the herbs contained in the sinister chest. Buying a key and opening the chest will profit you 2,248

Dropping monsters

Monster Combat level Quantity Rarity
Salarin the twisted 70 1 3; Uncommon
Chaos Fanatic 202 1 3; Uncommon
Magpie impling N/A (Hunter) 1 4; Rare