A cursed ushabti is an ushabti upgraded with cursed amascut sand. It can be used identically to a normal ushabti - to catch the souls of Slayer monsters to fill the Sunken Pyramid and Slayer codex. The cursed ushabti has a 50% increased catch chance over the normal ushabti. Due to the rarity and price of sand, it is best reserved for particularly high Slayer level or difficult monsters.