You manifest a whirlpool-like, swirling mass of darkness that ensnares and decays your victims. Choose a point on any level ground within range. For the duration, any creature that begins its turn within 40 feet of this point must succeed on a Strength saving throw or be pulled 20 feet closer to its centre. A flying creature has disadvantage on this saving throw.

Any creature that starts its turn within 20 feet of the point, or enters it on its turn, must make a Constitution saving throw. It takes 3d6 necrotic damage on a failure, or half as much on a success.