Huge huge fiend (demon), chaotic evil

Armor Class: 22

Hit Points: 464

Speed: 50 ft , swim: 50 ft

STR

29 +9

DEX

14 +2

CON

26 +8

INT

20 +5

WIS

17 +3

CHA

25 +7

Saving Throws: Dex +10, Con +16, Wis +11, Cha +15

Skills: 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.

Damage Resistances: cold, fire, lightning

Damage Immunities: poison; bludgeoning, piercing, and slashing that is nonmagical

Condition Immunities: charmed, exhaustion, frightened, poisoned

Senses: truesight 120 ft., passive Perception 29

Languages: All, telepathy 120 ft.

Challenge Rating: 26 ( 90000 XP)

Proficiency Bonus: +8

Actions

Multiattack. Demogorgon makes two Tentacle attacks. He can replace one attack with a use of Gaze.   Tentacle. Melee Weapon Attack: +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 DC 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 DC 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.

Bonus Actions

Feast: Consume a nearby dead body. Gains 3d10 of health.

Legendary Actions

Demogorgon can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Demogorgon regains spent legendary actions at the start of his turn.   Gaze. Demogorgon uses Gaze and must use either Beguiling Gaze or Confusing Gaze.   Tail. Melee Weapon Attack: +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.