Wrath of the Grave

Grasping undead appendages reach out from underground. Each creature large or smaller creature you designate (up to 10) within range must succed on a dexterity saving throw or become restrained by the arms, and can repeat a strength saving throw every two rounds, freeing themselves on a success. You may use a bonus action on each of your turns to cause 2d8 bludgeoning damage plus 2d8 necrotic damage to each restrained creature.