Demogorgon

AC 22 (natural armor)

HP 464 (32d12 + 256)

Speed 50 ft., swim 50 ft.

Saving Throws DEX +10, CON +16, WIS +11, CHA +15

Skills Insight +11, Perception +19

Resistances Cold; Fire; Lightning

Immunities Poison; (from nonmagical attacks)

Condition Immunities Charmed, Exhaustion, Frightened, Poisoned

Senses truesight 120 ft., Passive Perception 29

Languages all, telepathy 120 ft.

CR 26

Traits

Legendary Resistance (3/Day). If Demogorgon fails a saving throw, he can choose to succeed instead.

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

Two Heads. Demogorgon has advantage on saving throws against being blinded, deafened, stunned, or knocked unconscious.

Actions

Multiattack. Demogorgon makes two Tentacle attacks. He can replace one attack with a use of Gaze.

Tentacle. 17 to hit, reach 10 ft., one target. Hit: 28 (3d12 + 9) force damage. If the target is a creature, it must succeed on a 23 Constitution saving throw, or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if its hit point maximum is reduced to 0.

Gaze. Demogorgon turns his magical gaze toward one creature he can see within 120 feet of him. The target must succeed on a 23 Wisdom saving throw or suffer one of the following effects (choose one or roll a d6): 1–2: Beguiling Gaze: The target is stunned until the start of Demogorgon's next turn or until Demogorgon is no longer within line of sight. 3–4: Confusing Gaze: The target suffers the effect of the confusion spell without making a saving throw. The effect lasts until the start of Demogorgon's next turn. Demogorgon doesn't need to concentrate on the spell. 5–6: Hypnotic Gaze: The target is charmed by Demogorgon until the start of Demogorgon's next turn. Demogorgon chooses how the charmed target uses its action, reaction, and movement.

Legendary Actions

Gaze. Demogorgon uses Gaze and must use either Beguiling Gaze or Confusing Gaze.

Tail. 17 to hit, reach 15 ft., one target. Hit: 20 (2d10 + 9) bludgeoning damage plus 11 (2d10) necrotic damage.

Cast a Spell (Costs 2 Actions). Demogorgon uses Spellcasting.