Nexhathyr, Triune Demon Lord

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Huge Monstrosity (demon), Chaotic Evil

Armor Class 19 (natural armor)

Hit Points 246 (28d12+64)

Speed 40 ft. fly 60 ft.

STR 22 (+6)

DEX 16 (+3)

CON 22 (+6)

INT 18 (+4)

WIS 16 (+3)

CHA 22 (+6)

Saving Throws Con +10, Wis +7

Skills Perception +9, Intimidation +8

Damage Resistances fire; necrotic

Damage Immunities poison

Condition Immunities poisoned

Senses darkvision 120 ft., passive Perception 19

Languages Common, Infernal, Abyssal, telepathy 120 ft.

Challenge 14 (11,500 XP) Proficiency Bonus +4

Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.

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

Triune Presence. The demon lord exists in three bodies simultaneously, sharing a single mind. Each body can be targeted separately. The three bodies collectively share a single pool of vitality; when a body would be slain, the remaining bodies continue to fight. If all bodies are destroyed, Nexhathyr dies. The demon can reconstitute in a different body within 1 minute after a death event, preserving the overall fight.

Actions

Multiattack. The demon lord makes three attacks: two Claws and one Tail.

Claw. Melee weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 13 (2d6+6) slashing damage.

Bite. Melee weapon Attack: +15 to hit, reach 5 ft., one target. Hit: 15 (2d8+6) piercing damage.

Tail. Melee weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 15 (2d8+6) bludgeoning damage. If the target is Medium or smaller, it must succeed on a DC 18 Strength saving throw or be knocked prone.

Hellfire Breath (Recharge 5-6). The creature exhales fire in a 60-foot cone. Each creature in that area must make a DC 18 Dexterity saving throw, taking 42 (12d6) fire damage on a failed save, or half as much on a successful one.

Legendary Actions

The demon lord can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The demon regains spent legendary actions at the start of its turn.

Switch Body. The demon shifts to another body within 60 feet that is not currently incapacitated.

Extra Attack (Body A). One of Nexhathyr's other bodies makes a single Claw attack against a target within 10 feet.

Infernal Grasp (Costs 2 Actions). The demon attempts to seize a creature within 15 feet. The target must succeed on a DC 18 Strength saving throw or be pulled 15 feet toward Nexhathyr and restrained until the end of its next turn.

Environment Underdark, Mountain

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Lore & Description

Appearance

Nexhathyr appears as a towering, night-black figure with three distinct visages fused into one terrifying silhouette. Each body bears a different architecture of horror: one wears a crown of horned bone and seething eyes, another is enrobed in living ice-crystal armor that glints with internal flame, and the third is a serpentine, sinewed form covered in shifting scales. The trio moves in sync, their steps echoing like a chorus of whispers. When they speak, their voices merge into a single, dreadful thought that promises power through sacrifice. The Triune Demon Lord feeds on fear, corruption, and the fragmentation of will, wielding its multiple bodies to outmaneuver adventurers and strike where they are weakest.

Generation Info

Original prompt:
"A demon lord that exists in multiple bodies simultaneously."

Created: Feb 2, 2026
Modified: May 31, 2026