Uncanny Perception

You touch a creature and bolster its focus, making it extremely perceptive to weaknesses and tells during battle.

For the duration of the spell, the target is able to stack advantage up to two times. Double advantage allows the target to take the best of three rolls, rather than two. In addition, while under the effects of this spell, a creature with multiple sources of advantage and only one source of disadvantage will retain advantage, rather than having neither advantage nor disadvantage. Two sources of disadvantage will still cancel out any amount of advantage, however.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can stack one additional advantage for each slot level above 2nd. Triple advantage allows taking the best of four rolls, quadruple advantage the best of five, and so on.