Dark Arts: Drowning Demise

You create a swamp area under you, becoming difficult terrain. Once per turn you can sacrifice an action to control an tentacle and make an melee attack. If you do choose you can also sacrifice your Bonus Action too grab the attacked Victim and drag it into the swampy ground. If the target fails the initial DEX SAVE it counts as grappled and is dragged into the swampy grounds over the course of 2 rounds. If it fails to break free it takes suffocation damage.

While dragging a Target into the ground, the tentacle is occupied and cannot be used until the target breaks free or the target is completely submerged or dead