Twins' Vision

"Fate is tied to stars and Souls, and by catching a glimpse of either we can hope to discern a little of the future.  Then again... isn't proceeding in a pre-determined course surrendering to fate?" -Yog-Sothoth, one of the Twins of Change

The Twins grant you a glimpse of the near future.  Roll 1d20, and record the number rolled.  As a reaction while the duration lasts, you can replace an attack roll, saving throw, or ability check made by a creature you can see with this number.  Once you do this, the spell ends.

At Higher Levels. At 11th level, you can roll two 1d20s.  You can use either number to replace a roll, but the spell ends after one replacement.