Foresight

9th-Level Divination Spell (Bard, Druid, Warlock, Wizard)

Casting Time: 1 minute
Range: Touch
Components: V, S, M (a hummingbird feather)
Duration: 8 hours

You touch a willing creature and bestow a limited ability to see into the immediate future. For the duration, the target has

If you have Advantage on a D20 Test, roll two d20s, and use the higher roll. A roll can't be affected by more than one Advantage, and Advantage and Disadvantage on the same roll cancel each other. See also D20 Tests.

on

D20 Tests encompass the three main d20 rolls of the game: ability checks, attack rolls, and saving throws. If something in the game affects D20 Tests, it affects all three of these rolls. The DM determines whether a D20 Test is warranted in a given circumstance. See also D20 Tests.

, and other creatures have

If you have Disadvantage on a D20 Test, roll two d20s and use the lower roll. A roll can't be affected by more than one Disadvantage, and Advantage and Disadvantage on the same roll cancel each other. See also D20 Tests.

on attack rolls against it. The spell ends early if you cast it again.

Source: Player's Handbook, p. 276