Archon Guardian

Angelic Weapon: The Archon Guardian's weapon attacks are magical. When the Archon Guardian hits with any weapon, the weapon deals 14 (3d8) radiant damage regardless of the weapon type.

Ethereal: The Archon Guardian can only take a maximum of 10 damage per round, regardless of how many attackers or how many attacks it takes in that round.

Conviction Aura: Reduces the resistances of all enemies within 30 feet by 50 percent and reduces their AC by -2. Does not affect any natural immunities.

Conversion: If the Archon Rolls a Natural 20, the enemy is converted to your side after the end of 3 rounds, that creature then permanently and willingly serves Winter Haven (unless it is another player character).

Telepathic Bond: The Archon Guardian shares a telepathic bond with its master and can communicate with them regardless of distance.

Spellcasting - The Archon Guardian is an innate spellcaster. Their spellcasting ability is WIS (spell save DC 18, +8 to hit with spell attacks). The Archon Guardian has the following spells prepared:

Decrepify: Slows walking speed of target to 10 feet per round. All ranged attacks made by a creature cursed in this manner are limited to a range of 30 feet. Any player targeted by a ranged attack from a cursed creature can dodge the attack completely with a successful DC 12 DEX saving throw.
Blacksoul Lightning: Range: 120 ft: Black lightning shoots forth causing lightning and psychic damage to all creatures in its path. Any creature within 5 ft of a struck creature also takes the damage.
Convert (1/day): The enemy target must roll a d20 against the Archon Wisdom +modifiers. If they fail, they join the party as a companion. May only be cast on undead or demons.
Life Tap: As part of their telepathic bond, the Archon Guardian can funnel up to 10 HP from its own HP pool to its master per round.

Angelic Weapon: Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (3d8) radiant damage. 

Blacksoul Lightning: Ranged Spell Attack: +12 to hit, range 120 ft., multiple targets. Hit: (1d12) lightning damage plus (1d6) psychic damage to all creatures in the path and all creatures within 5 feet of the creatures struck.

Convert (1/day): The enemy target must roll a d20 against the Archon Wisdom +modifiers. If they fail, they join the party as a companion. May only be cast on undead or demons.

Decrepify. Slows walking speed of target to 10 feet per round. All ranged attacks made by a creature cursed in this manner are limited to a range of 30 feet. Any player targeted by a ranged attack from a cursed creature can dodge the attack completely with a successful DC 12 DEX saving throw.

Life Tap: As part of their telepathic bond, the Archon Guardian can funnel up to 10 HP from its own HP pool to its master per round.

Reaction Name. Opportunity Attack.