Arm of the Far Realm

You conjure a tentacle whose slick purple skin crackles with electricity. The tentacle sprouts from the ground in an unoccupied space of your choice that you can see within range. When you cast this spell, you can direct the tentacle to lash out at a creature within 30 feet of it that you can see. That creature must succeed on a Dexterity saving throw or be pulled 20 feet directly toward the tentacle. Creatures pulled in this way take 5d10 lightning damage.

Until the spell ends, you can direct the vine to lash out at the same creature or another one as an action on each of your turns.