Planetar

The monster knows if it hears a lie.

If the monster 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 monster has Advantage on saving throws against spells and other magical effects.

The monster makes three attacks or uses twice.

. .

Dexterity Saving Throw: DC , each in a -foot-radius Sphere centered on a point the monster can see within feet.
Failure: damage.
Success: Half damage.

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

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