Tox's Polarizer

In reaction to a creature rolling a skill check, ability check, or saving throw, you attempt to sway the roll to its extremes. If the natural role of the dice is 10 or lower, a -2 modifier is applied. If the natural role of the dice is 11 or higher, a +2 modifier is applied

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the modifiers increase by 1 for each level above 1st.