Fraz-Urb'luu

Large fiend (demon), chaotic evil

Armor Class 18 (natural armor)

Hit Points 350 (28d10+196)

Speed 40 ft., fly 40 ft.

Saving Throws Dex +8, Con +15, Int +15, Wis +14

Skills Deception +15, Perception +14, Stealth +8

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.

Languages all, telepathy 120 ft.

Challenge 23 (50,000 XP)

Innate Spellcasting. Fraz-Urb’luu’s spellcasting ability is Charisma (spell save DC 23). Fraz-Urb’luu can innately cast the following spells, requiring no material components:

At will: alter self (can become Medium-sized when changing his appearance), detect magic, dispel magic, phantasamal force

3/day each: confusion, dream, mislead, programmed illusion, seeming

1/day each: mirage arcane, modify memory, project image

Legendary Resistance (3/Day). If Fraz-Urb’luu fails a saving throw, he can choose to succeed instead.

Magic Resistance. Fraz-Urb’luu has advantage on saving throws against spell and other magic effects.

Magic Weapon. Fraz-Urb’luu’s weapon attacks are magical.

Undetectable. Fraz-Urb’luu can’t be targeted by divination magic, perceived through magical scrying sensors, or detected by abilities that sense demons or fiends.

Actions

Multiattack. Fraz-Urb’luu makes three attacks: one with his bite and two with his fists.

Bite. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 23 (4d6 + 9) piercing damage.

Fist. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 27 (4d8 + 9) bludgeoning damage.

Legendary Actions

Fraz-Urb’luu 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 creautre’s turn. Fraz-Urb’luu regains spent legendary actions at the start of his turn.

Tail. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 31 (4d10 + 9) bludgeoning damage. If the target is a Large or smaller creature, it is also grappled (escape DC 24). The grappled target is also restrained. Fraz-Urb’luu can grapple only one creature with his tail at a time.

Phantasmal Killer (Costs 2 Actions). Fraz-Urb’luu casts phantasmal killer, no concentration required.