its during Lady Boyle's Last Party mission when you get in the estate You can head up through the servant stairs, or steal the whale oil closet key from the guard near the Wall of Light
Dishonored: Whale Oil Closet Key
From Orcz
its during Lady Boyle's Last Party mission when you get in the estate You can head up through the servant stairs, or steal the whale oil closet key from the guard near the Wall of Light