Arms of the Deep

You create 3 tentacles made of pure water around you. As part of the action used to cast this spell, you can make a melee spell attack against a target within range using all 3 of the tentacles. If it hits, the target takes 3d4 bludgeoning damage and 3d6 cold damage. The target must also succeed on a Strength saving throw or be grappled. While grappled in this way, the target takes 1d6 cold damage at the start of its turn. The grappled target can attempt the save again at the end of each of its turns until the spell ends. While a target is grappled in this way, you may not move more than 30 feet away from the target, trying to do so results in a failure to move in that way.

While maintaining concentration on this spell, you can use your action to attack a target within range of the spell. However, if a target is already grappled by this spell and you choose to attack another target, the tentacles release and the previous target is no longer grappled.

At Higher Levels. When cast this spell using a spell slot of 3rd or higher, the initial bludgeoning damage increases by 1d4, and both instances of cold damage increase by 1d6 for each level above 2nd level.