Celestial's Sight

3rd-level divination (Solarmancy)
Casting Time: 1 action
Range: Touch
Components: V, S, M (An Uncommon or rarer Sunstone and ointment for the eyes)
Duration: 1 hour

You magically anoint a creature’s eyes with the power of a Celestial. For the duration, their eyes glow an otherworldly color. They can see into both magical and nonmagical darkness as if it were bright light, they have advantage on Investigation checks to discern whether or not something is obscured by an Illusion, and a Fiend or Undead that enters their sight must immediately make a Charisma saving throw, or faintly glow while within their sight until the spell ends. If a creature succeeds on this saving throw, they are immune to this effect for the next 24 hours.

In addition to this, being in Direct Sunlight further expands their Celestial awareness and they have advantage on Initiative rolls.

At higher levels: When you cast this spell using a spell slot of 4th level or higher, you can target one additional creature of your choice that is within 10 feet of the target.