Seer

Whenever you take a short or long rest, roll 1d10 and record the result. Whenever you or a creature you can see makes an attack roll, skill check, or saving throw, you may use your reaction to add or subtract that result from the roll. You may use this after the roll, but before the result of the roll is determined. Once you use this, you may not do so again until you complete a short or long rest.