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Halldir's Cairn is located just south of the Dark Brotherhood Sanctuary. Inside, there are numerous mushrooms and a strange cairn surrounded by dead bodies from which emanates a magic beam. Next to the pile of stones is a pedestal with Agrius's Journal and the Key to Halldir's Crypt.
Along the way through the cave, the Dragonborn is attacked by at least eight subjugated ghosts.
 Halldir's Crypt
Here, the Dragonborn confronts Halldir.