Sphere of Conviction

Mind of the Machine: When you finish a long
rest, roll a d20 and record the number rolled.
You can replace any attack roll, saving throw,
or ability check made by you or a creature that
you can see with this roll. You must choose to
do so before the roll, and you can replace a roll
in this way only once per turn.
This roll can be used only once. When you finish
a long rest, you lose any unused roll.