Planetar

The planetar knows if it hears a lie.

If the planetar dies outside Mount Celestia, its body disappears, and it gains a new body instantly, reviving with all its Hit Points somewhere in Mount Celestia.

The planetar has Advantage on saving throws against spells and other magical effects.

The planetar makes three Radiant Sword attacks or uses Holy Burst twice.

plus 18 (4d8) Radiant damage

Dexterity Saving Throw: DC 20, each enemy in a 20-foot-radius Sphere centered on a point the planetar can see within 120 feet. Failure: 24 (7d6) Radiant damage. Success: Half damage.

The planetar casts one of the following spells, requiring no Material components and using Charisma as spellcasting ability (spell save DC 20):
At Will: Detect Evil and Good
1/Day Each: Commune, Control Weather, Dispel Evil and Good, Raise Dead

The planetar casts Cure Wounds, Invisibility, Lesser Restoration, or Remove Curse, using the same spellcasting ability as Spellcasting.