Tendrils of the Terrible

4 tendrils of dark power emerge from your back. The tendrils have a reach of 15ft and can be used to grapple dealing 1d8 Necrotic DMG and attack an enemy dealing 1d10 Necrotic DMG on a hit. Creatures hit by the tendrils must succeed on a CON saving throw or be marked by the dark power dealing 1d8 Necrotic DMG for 1 minute and the creature can continue to make saving throws until they succeed. The more tendrils you use to attack a creature the more d10's of Necrotic DMG is dealt (3 tendrils = 3d10) and advantage is granted if multiple tendrils are used to grapple a creature.

As appose to using them to attack, you can also use the tendrils to grab items from enemies and both must make contrasting STR checks with advantage if you use more than 1 tendril. If the caster fails to grab the item, the opposing creature gains an attack of opportunity.