Tentacles of the Deep

Conjure a pool of churning water filled with three large tentacles over a 20-foot sphere in an area you can see within range. For the duration of the spell, the area becomes difficult terrain.

Tentacles of the Deep: When a creature besides the caster enters the effected area for the first time on its turn or starts its turn within the effected area, they must succeed on a Dexterity saving throw or take 2d6 bludgeoning damage. You may use a bonus action to command one of the tentacles to grab a creature within the area of the spell; the targeted creature must succeed on a Dexterity saving throw, or take 2d6 damage and becoming restrained.

A creature that is restrained by one of the tentacles takes 3d6 bludgeoning damage at the start of each of its turns. It can spend an action to attempt an escape, making a Strength check against your spell save DC to free itself. While restrained the effected creature cannot be attacked by other tentacles.

Higher Spell Levels: If you cast this spell with a spell slot of 5th level or higher increase the size of the effected area by 5 feet, tentacles spawned by 1, and damage by 1d6 per level.