Asrid's Afflictive Assertion

You make a comment to a creature highlighting a previously unperceived flaw of theirs. The creature has to make a charisma saving throw and take 4d6 psychic damage or half on a successful save. If the creature fails the saving throw, it gains vulnerability to a damage type of your choice for the duration of the spell. if the target has resistance to the chosen damage type, it takes normal damage instead. If the target is immune to the chosen damage type, it takes resisted damage instead. 

If the target has less than 4 intelligence or if you do not share a language with the target, the spell fails.

At higher levels: The target takes 2d6 more damage for every level over 2nd