Portent

Glimpses of the future begin to press on your awareness. Whenever you finish a Long Rest, roll two d20s and record the numbers rolled. You can replace any d20 Test made by you or a creature that you can see with one of these foretelling rolls. You must choose to do so before the roll, and you can replace a roll in this way only once per turn.

Each foretelling roll can be used only once. When you finish a Long Rest, you lose any unused foretelling rolls.