The Restless Sands is a random event that spawns near the center of the western part of the Stinging Winds. The event itself takes up most the area, so it's hard to miss. To start the event, the player has to talk to Mehtan the Necromancer. He'll ask the player to activate 2 Necromancer Totems, which will spawn a pair of Deathly Haunts. After beating them, talk to Mehtan again. He'll thank the player, but they are then ambushed by deranged cultists and Wargiant, a Unique Dark Berserker. Talking to Mehtan will have him thank the player again and reward you with gold, experience, and the challenge "The Restless Sands".