Celestial Creature (5e Template)
From D&D Wiki
Celestial creatures dwell on the upper planes, the realms of good, although they resemble beings found on the Material Plane. They are more regal and more beautiful than their earthly counterparts.
"Celestial" is a template that can be applied to any corporeal aberration, beast, dragon, fey, giant, humanoid, monstrosity, ooze, or plant, hereafter referred to as the "base creature."
Type. If the base creature's type is aberration, dragon, ooze, or plant, the creature retains its type. Otherwise, the creature's type becomes celestial.
Damage Resistances. A celestial creature is resistant to cold, fire, and lightning damage, as well as to bludgeoning, piercing, and slashing damage from nonmagical attacks.
Senses. The celestial creature gains darkvision to a range of 60 feet. If the base creature has darkvision to a range greater than 60 feet, use the range for the base creature's darkvision instead.
Languages. If the base creature speaks at least one language, add Celestial to the list of languages known.
Alignment. If the base creature has an alignment, its alignment becomes good. (no change on the law/chaos axis)
Magic Resistance. The celestial creature has advantage on saving throws against spells and other magical effects.
The celestial creature's challenge rating requires recalculation if the base creature does not have both resistance to bludgeoning, piercing, and slashing damage from nonmagical attacks and the Magic Resistance trait.