Tentacles of the Void

Tentacles As a bonus action, you can summon ephemeral tendrils of energy to lash out at your foes. This ability has an instant casting time. Choose a creature within 10 feet. The creature must succeed on a Dexterity saving throw (DC = 8 + your proficiency bonus + your Charisma modifier) or take psychic damage equal to 1d8 + your proficiency bonus. You can use this feature a number of times equal to your proficiency bonus, and you regain all uses after finishing a long rest. damage increases to 2d8 at level 6, 3d8 at level 12, then 4d8 at level 18