Armor Class 20 (natural armor)
Hit Points 346 (33d10 + 165)
Speed 40 ft.
Saving Throws DEX +9, CON +12, WIS +12
Skills Deception +15, Insight +12, Perception +12, Persuasion +15
Damage Resistances cold, fire, lightning
Damage Immunities poison, [object Object]
Condition Immunities charmed, exhaustion, frightened, poisoned
Senses truesight 120 ft., passive Perception 22
Languages all, telepathy 120 ft.
Challenge 24
Shapechanger. Graz'zt can use his action to polymorph into a form that resembles a Medium humanoid, or back into his true form. Aside from his size, his statistics are the same in each form. Any equipment he is wearing or carrying isn't transformed.
Legendary Resistance (3/Day). If Graz'zt fails a saving throw, he can choose to succeed instead.
Magic Resistance. Graz'zt has advantage on saving throws against spells and other magical effects.
Magic Weapons. Graz'zt's weapon attacks are magical.
Multiattack. Graz'zt attacks twice with Wave of Sorrow.
Wave of Sorrow (Greatsword). Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 20 (4d6 + 6) slashing damage plus 10 (3d6) acid damage.
Teleport. Graz'zt magically teleports, along with any equipment he is wearing or carrying, up to 120 feet to an unoccupied space he can see.
Attack. Graz'zt attacks once with Wave of Sorrow.
Dance, My Puppet. One creature charmed by Graz'zt that Graz'zt can see must use its reaction to move up to its speed as Graz'zt directs.
Sow Discord. Graz'zt casts crown of madness or dissonant whispers.
Teleport. Graz'zt uses his Teleport action.
Mordenkainen's Tome of Foes, p. 149