The combination is an item used in the Death Plateau quest. It is obtained by inspecting an iou given to the player by Harold in lieu of paying a gambling debt he owes from losing a dice rolling game.
The combination is a cryptic list of clues that give the relative locations of a set of coloured stone balls that must be positioned on a device which locks and unlocks the equipment room in Burthorpe Castle. If lost, the combination can be obtained by talking to Harold again.
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