Summon an aberrant spirit (Beholderkin, Slaad, or Star Spawn) that lasts 1 hour (Concentration). It uses your spell attack modifier and proficiency bonus and obeys your verbal commands. Higher Slot: the spirit's maximum HP increases by 10 per slot level above 4.

Material: a pickled tentacle and an eyeball in a platinum-inlaid vial worth 400 gp