True Seeing

Source: Player's Handbook

Level 6 Divination (Bard, Cleric, Sorcerer, Warlock, Wizard)

Casting Time: Action
Range: Touch
Components: V, S, M (mushroom powder worth 25+ GP, which the spell consumes)
Duration: 1 hour

For the duration, the willing creature you touch has Truesight with a range of 120 feet.