You siphon a fragment of a creature’s knowledge. One humanoid creature you can see must make an Intelligence saving throw. On a failed save, it takes 6d8 psychic damage, and you gain temporary access to one of its known spells (of 3rd level or lower, chosen randomly or by the DM). You may cast that spell once during the duration without using a spell slot or components.   The target can repeat the saving throw at the end of each of its turns. On a success, the connection is severed.