Brass key - OSRS Wiki

The brass key is a key which allows the player to enter the locked shed found west of the Cooking Guild. The shed provides an alternate entrance to the Edgeville Dungeon, entering north of the Hill Giant room.

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Edgeville Dungeon Entrance in RuneScape (Get Brass Key)

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Brass key, RuneScape Wiki

Brass key - OSRS Wiki

Brass key, RuneScape Wiki