Monadic Deva

(from Planescape Monstrous Compendium Appendix I - 1994):

On rare occasions, a power from the Upper Planes needs a servant to go to one of the Elemental or Paraelemental Planes. When this need arises, monadic devas are used. Monadics can pass into any Elemental Plane at will and survive there without ill effect.

Devas inhabit the good-aligned Outer Planes: Arborea, Arcadia, the Beastlands, Bytopia, Elysium, Mount Celestia, and Ysgard. These proxies of the powers appear as stunningly handsome humans with large, feathery wings fanning gracefully from their shoulders.

Combat: : Unlike the astral devas, monadics are of strong, bulky build and rely more upon strength than on speed and agility. Monadic devas have Strength 20 (+8 damage adjustment). These strong stewards of the gods carry a great metal rod enchanted to give +3 on all attack and damage rolls. This weapon has all properties of a rod of smiting. Only the owner can use these powers, and the weapon never runs out of charges. Solid creatures (for example, those made of stone) and metal-armored opponents suffer an additional ld8 points of damage per hit.

Monadic devas can use all common powers shared by devas. The light they shed can extend from 3 to 30 feet as desired. The protection from evil sphere is half power (+1) but has a 15-foot radius. Monadic devas have two additional abilities, usable one at a time, once per round: hold monster and mirror image.

Monadic devas are immune to death magic and to life level loss from magic or undead. They also have a power similar to charm person that works on elementals. The spell-like power works like the wizard spell, but only on elementals.

MONADIC DEVA - 5e Homebrew Stat Block

Medium Celestial, Any Good

Armor Class: 17 (natural armor)

Hit Points: 136 (16d8 + 64)

Speed: 40 ft., fly 120 ft.

STR 20 (+5), DEX 18 (+4), CON 18 (+4), INT 17 (+3), WIS 20 (+5), CHA 20 (+5)

Saving Throws: WIS +9, CHA +9

Skills: Insight +9, Perception +9

Damage Resistances: Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

Damage Immunities: Fire, Cold, Lightning, Acid, Poison, Radiant, Necrotic

Condition Immunities: Charmed, Exhaustion, Frightened

Senses: Darkvision 120 ft., Passive Perception 19

Languages: All, Telepathy 120 ft.

Challenge 11 (7,200 XP)

Proficiency Bonus +4

Angelic Weapons. The deva's weapon attacks are magical. When the deva hits with any weapon, the weapon deals an extra 4d8 radiant damage (included in the attack).

Innate Spellcasting. The deva's spellcasting ability is Charisma (spell save DC 17). The deva can innately cast the following spells, requiring only verbal components:

At will: charm person (works only on elementals), detect evil and good, see invisibility, mirror image

1/day each: commune, raise dead, hold monster

Magic Resistance. The deva has advantage on saving throws against spells and other magical effects.

ACTIONS

Multiattack. The deva makes two melee attacks.

Rod of Smiting. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 8 (1d6 + 5) bludgeoning damage plus 18 (4d8) radiant damage. When the deva rolls a 20 on an attack roll made with this weapon, the target takes an extra 7 bludgeoning damage, or 14 bludgeoning damage if it's a construct. If a construct has 25 hit points or fewer after taking this damage, it is destroyed.

Healing Touch (3/Day). The deva touches another creature. The target magically regains 20 (4d8 + 2) hit points and is freed from any curse, disease, poison, blindness, or deafness.

Change Shape. The deva magically polymorphs into a humanoid or beast that has a challenge rating equal to or less than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the deva's choice).

In a new form, the deva retains its game statistics and ability to speak, but its AC, movement modes, Strength, Dexterity, and special senses are replaced by those of the new form, and it gains any statistics and capabilities (except class features, legendary actions, and lair actions) that the new form has but that it lacks.