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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.


Item Quantity Rarity GE market price
Grimy ranarr weed Grimy ranarr weed 3 (noted) Always 23,667
Grimy harralander Grimy harralander 2 (noted) Always 1,264
Grimy irit leaf Grimy irit leaf 1 (noted) Always 886
Grimy avantoe Grimy avantoe 1 (noted) Always 1,838
Grimy kwuarm Grimy kwuarm 1 (noted) Always 1,242
Grimy torstol Grimy torstol 1 (noted) Always 7,758
  • 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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