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You mean Death's Dominion? You need Death's Skullcap, Death's Chest Warmer, Death's Knickers, and Death's Repulse which is a shield. I could better help you if you tell me what of those you don't have. You can find them in Death's Repose. My guess is you might not have Death's Knickers. You have to drop down a hole. It's random whether that hole is visible or not depending on when you step next to it.