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To obtain the Disturbed Grave Mystery in Marvel’s Midnight Suns, break the breakable wall in the southern part of the Dreamer’s Descent. You’ll discover a graveyard behind it with a disturbed grave. Across from the grave, there will be a red spell circle on the ground. Use the Reveal Word of Power there to find Skeletal Remains. Place these remains in the grave to spawn a legendary arcane chest. Loot the chest to complete the mystery!