Old School RuneScape Wiki
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The key is a quest item used in the Olaf's Quest quest. It is obtained by killing skeletons in a secret dungeon, and is used to unlock a door to progress further into the dungeon. The key is randomly selected from one of the five available, and the player must obtain that key to unlock the door.

Dropping monsters

Monster Combat level Quantity Rarity
Skeleton fremennik 40; 50; 60 1 1; Always
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