Thoughtseize

Pricking your finger, you pour out a drop of blood onto the ground, losing 2 hit points. Choose a target creature you can see within range, forcing it to make an Intelligence saving throw. On a failed save, that creature takes 2d8 psychic damage and gains disadvantage on its next attack roll. Extract a single attribute from that creature. Attributes include the following: Damage Vulnerabilities, Damage Resistances, Damage Immunities, and Condition Immunities. On a successful save, target creature takes half as much damage, does not gain disadvantage, and no attribute is extracted.

"Knowledge is such a burden. Release it. Release all your fears..."