Cthylla`s Mercy

The caster calls for the intervention of an entity from beyond to protect him from an attacker, the call is answered in the form of an enormous limb in the form of the tentacle of some kind of monstrous octopus made of a strange material half physical half ethereal that springs from the ground beneath the attacker and wraps himself around it forcing it to make a Dexterity saving throw, on a failed save its grappled .

The tentacle can only grapple one creature at any time and only creatures of large size or smaller occupying the same space that they do, once the victim is grappled all saving throws to escape have disadvantage  and even if the victim were to scape the tentacle will remain and in the turn of the one who cast it will try to grapple anyone within 10 ft, it prioritizes enemies but it will attack allies if no enemies are in range.

A grappled creature takes 2d6 bludgeoning damage every turn and it's suffocating, it does not matter if the tendril is blocking the entry of air of the victim for the suffocation effect to take place. The space the tendril occupies becomes void of air and if the victim fails one of the saves to escape the grapple with a natural 1  it will lose the grip of their remaining air in their lungs which will cause it to start choking.

Casting this spell with a higher spell slot increases the damage by 1d6 for every spell slot above 1, for every 2 spell slots levels used to cast this spell above 1 increase the range of the tentacle by 5 feet, if cast with a spell slot of 5 or higher the tendril will no longer need concentration to maintain.