Crimson Kraken

You tap into the latent power within your own blood and release it to spawn one or two tentacles of blood from your person to strike your enemies. You sacrifice 5 of your hit points to spawn a single tentacle and gain 5 temporary hit points for each tentacle spawned. The tentacles last for the duration or until you lose their associated temporary hit points. 

When you cast the spell, each of your tentacles can make a melee spell attack against a creature within 5 feet of you. On a hit, the target takes necrotic damage equal to 1d8 + your spellcasting ability modifier. On subsequent turns, until the spell ends, you can make the attacks again with any remaining tentacles on each of your turns as a bonus action.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can sacrifice 5 more hit points, gain 5 more temporary hit points and spawn an additional tentacle for every slot level above 2nd through 8th level. If you cast this spell using a 9th level spell slot you can summon up to 10 tentacles and their damage die increases from a d8 to a d10.