Huge undead, chaotic evil

Armor Class: 26 (Bramble Gloves)

Hit Points: 315 30d10+150

Speed: 50 ft , fly: 50 ft , can hover

STR

14 +2

DEX

20 +5

CON

20 +5

INT

21 +5

WIS

15 +2

CHA

24 +7

Saving Throws: Con +13, Dex+13, Cha +15

Skills: Stealth +13, Persuasion +23, Intimidation +15, Deception +23, Perception +10

Damage Resistances: Acid, Fire, Poison

Senses: darkvision 60 ft., Passive Perception 20

Languages: Abyssal, Barovian, Common, Infernal

Challenge Rating: 25

Proficiency Bonus: 8

Actions

Multiattack. Merrun uses her Drain Life ability if she has it. Then she can make 3 attacks, two weapon attacks, and one Bite attack. She can use her Claws instead of her Bite.     Bite. Melee Weapon Attack: d20+11 to hit, reach 5 ft., one target. Hit: 19 2d6+5 magical piercing damage. If the target is a creature, Merrun regains the damage as health. Claws. Melee Weapon Attack: d20+12 to hit, reach 5 ft., one target. Hit: 19 d6+2 magical slashing damage.
Forsaken Brand. Melee Weapon Attack: d20+11 to hit, reach 5 ft,. one target. Hit: 23 1d8+5 magical slashing damage plus 27 4d8 fire damage.
Forsaken Arrow. Ranged Weapon Attack: d20+15 to hit, range 150/600 ft., one target. Hit: 24 2d8+6 piercing damage plus 27 6d8 necrotic damage. If the target is a creature, it can't regain hit points until the start of Merrun's next turn.
Life Drain (Recharge 5-6). Merrun targets one creature she can see within 120 feet of her. The target must succeed on a DC 19 Constitution saving throw, taking 36 8d8 necrotic damage on a failed save, or half as much on a successful one.
Merrun regains a number of hit points equal to half the amount of damage dealt.

Children of Blood (1/Day). Merrun magically calls 3d6 Imps. While outdoors, Merrun can call 2d4 Hellwasps instead. The called creatures arrive in 1d4 rounds, acting as allies of Merrun and obeying her spoken commands. The creatures remain for 1 hour, until Merrun dies, or until Merrun dismisses them as a bonus action.

Bonus Actions

Blood Bend. Merrun targets one creature she can see within 60 feet of herself that is sharing her blood. The target must succeed on a DC 20 Wisdom saving throw or be paralyzed. The creature can repeat its saving throw ad the end of its turn. The effect also ends when Merrun chooses to target another creature.

Legendary Actions

Merrun 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. Merrun regains spent legendary actions at the start of her turn.   Move. Merrun moves up to her speed without provoking opportunity attacks.
Forsaken Brand. Merrun makes a Forsaken Brand attack.
Red Cocoon (Costs 3 Actions). Merrun creates a cocoon of thinly webbed blood silk around a creature she can see within 60 feet of it. The target must succeed on a DC 21 Dexterity saving throw or take 31 (9d6) acid damage.

Lair Actions

While Merrun is in Lair, she can take lair actions as long as she isn't incapacitated.
On initiative count 20 (losing initiative ties), Strahd can take one of the following lair action options, or forgo using any of them in that round:

Until initiative count 20 of the next round, Strahd can pass through solid walls, doors, ceilings, and floors as if they weren't there.
 

Regional Effects

The region surrounding a Merrun's lair is warped by her unnatural presence, creating any of the following effects: