Boon of Apex Divination (5e Epic Boon)

You have mastered the magical school of divination.

Choose a first level divination spell you can cast. You can now cast it at will.
When you finish a long rest, roll 2 d20s and record the results. Anytime before your next long rest, you can substitute any d20 roll for one of the rolls you made. You can only use each roll once.
If you have a divination spell that grants you advantage on a certain type of d20 roll, you can cast it as an action or a bonus action, and its duration is doubled.