Demilich

Tiny undead, neutral evil
Armor Class 20 (natural armor)
Hit Points 80 (32d4)
Speed 0 ft., fly 30 ft. (hover)
STR
1 (-5)
DEX
20 (+5)
CON
10 (+0)
INT
20 (+5)
WIS
17 (+3)
CHA
20 (+5)
Saving Throws Con +6, Int +11, Wis +9, Cha +11
Damage Resistances bludgeoning, piercing, and slashing from magic weapons
Damage Immunities necrotic, poison, psychic; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities charmed, deafened, exhaustion, frightened, paralyzed, petrified, poisoned, prone, stunned
Senses truesight 120 ft., passive Perception 13
Languages
Challenge 18 (20000 XP)
Avoidance.
Legendary Resistance (3/Day).
Turn Immunity.
Actions
Howl (Recharge 5–6).
Life Drain.
Legendary actions
Cloud of Dust.
Energy Drain (Costs 2 Actions).
Vile Curse (Costs 3 Actions).

This full creature's stat block is not available (not OGL).

Monster Manual
Demilich