Mind Sliver

{e}: You drive a disorienting spike of psychic
energy into the mind of one creature you
can see. The target must succeed on an
INT save or take 1d6 psychic DMG and
subtract 1d4 from the next saving throw it
makes before the end of your next turn.
———{line}{line}{line}{line}{w}{r}{r/w}{u/b}{line}{line}{line}{line}{line}{line}
+1d6 at level 5(2d6), 11(3d6), 17(4d6)