Nightwalker (5.5)

Huge Undead, Typically Chaotic Evil
Armor Class 14
Hit Points 337 (25d12 + 175)
Speed 40 ft., fly 40 ft.
STR
22 (+6)
DEX
19 (+4)
CON
24 (+7)
INT
6 (-2)
WIS
9 (-1)
CHA
8 (-1)
Saving Throws Con +13
Damage Resistances acid, cold, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities necrotic, poison
Condition Immunities exhaustion, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained
Senses darkvision 120 ft., passive Perception 9
Languages
Challenge 20 (25000 XP)     Proficiency Bonus +6
Annihilating Aura.
Life Eater.
Unusual Nature.
ACTIONS
Multiattack.
Enervating Focus.
Finger of Doom (Recharge 6).

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

Monsters of the Multiverse
Nightwalker (5.5)