Tentacle of the Deep

You summon a spectral tentacle at a point you can see within range. Make a melee spell attack against a creature within 10 feet of the tentacle. On a hit, the target takes 1d8 bludgeoning damage and must succeed on a Strength saving throw against your spell save DC or become restrained until the end of your next turn.

As a bonus action on subsequent turns, you can move the tentacle up to 10 feet and repeat the attack against a creature within 10 feet of it.