Abyssal Whisper

You whisper a fragment of abyssal thought into the mind of one creature you can see within range. The target must succeed on an Intelligence saving throw or take 1d6 psychic damage, and the next time it makes a saving throw before the end of your next turn, it must roll a 1d4 and subtract the number rolled from the save.

At Higher Levels.
This spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).