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The sinister chest is a locked chest located in the Agility Dungeon in Yanille. It is in a part of the dungeon that requires 49 Agility to access. The chest can only be unlocked with the sinister key, which is a drop from Salarin the twisted and the Chaos Fanatic or a possible loot from a magpie impling jar/magpie impling. If opened, the chest will emit a toxic gas, which poisons the player so it is advised to bring an antipoison or other method of curing or preventing poison.

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Item Quantity Rarity GE market price
Grimy ranarr weed.png Grimy ranarr weed 3 (noted) Always 22,920
Grimy harralander.png Grimy harralander 2 (noted) Always 1,348
Grimy irit leaf.png Grimy irit leaf 1 (noted) Always 775
Grimy avantoe.png Grimy avantoe 1 (noted) Always 1,814
Grimy kwuarm.png Grimy kwuarm 1 (noted) Always 1,165
Grimy torstol.png Grimy torstol 1 (noted) Always 8,341
  • Repeatedly using keys on the chest stalls the poison effect, thus retaining your health until you leave (assuming the skeletons are not aggressive)
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