Sure! Here's a stat block for a powerful undead monster in Dungeons & Dragons fifth edition:

Name: Dreadlord Drazmorg

Type: Undead

Alignment: Chaotic Evil

Armor Class: 22 (natural armor)

Hit Points: 300 (24d12 + 144)

Speed: 30 ft., fly 60 ft.

Abilities:
Ability	Score	Modifier
STR	24	+7
DEX	16	+3
CON	22	+6
INT	18	+4
WIS	16	+3
CHA	20	+5

Saving Throws: Str +12, Con +11, Wis +10

Skills: Perception +10, Intimidation +12

Damage Resistances: Necrotic, Poison; Bludgeoning, Piercing, and Slashing from nonmagical weapons

Damage Immunities: Cold, Poison

Condition Immunities: Charmed, Exhaustion, Frightened, Poisoned

Senses: Darkvision 120 ft., passive Perception 20

Languages: Common, Abyssal

Challenge Rating: 20 (25,000 XP)

Special Abilities:

Fear Aura. Any creature that starts its turn within 30 feet of Dreadlord Drazmorg must make a DC 20 Wisdom saving throw or be frightened for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself with a successful save.

Life Drain. Dreadlord Drazmorg can use its action to make a melee spell attack against a creature within 10 feet of it. On a hit, the target takes 6d10 necrotic damage, and Dreadlord Drazmorg regains hit points equal to the damage dealt.

Legendary Resistance (3/Day). If Dreadlord Drazmorg fails a saving throw, it can choose to succeed instead.

Legendary Actions:

Dreadlord Drazmorg can take 3 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. Dreadlord Drazmorg regains spent legendary actions at the start of its turn.

Life Drain. Dreadlord Drazmorg makes a melee spell attack with its Life Drain ability.

Necrotic Blast (Costs 2 Actions). Dreadlord Drazmorg releases a wave of necrotic energy in a 30-foot cone. Each creature in that area must make a DC 20 Constitution saving throw, taking 8d8 necrotic damage on a failed save, or half as much damage on a successful one.

Move. Dreadlord Drazmorg moves up to its speed without provoking opportunity attacks.

With its terrifying aura, life-draining abilities, and resistance to most forms of damage, Dreadlord Drazmorg is a formidable undead creature that can challenge even the most experienced adventurers. Be prepared for a grueling battle when facing this fearsome monster!
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