Legendary Resistance (3/Day). If Vlad Von Carstein fails a saving throw, he can choose to succeed instead.

 Regeneration. Vlad Von Carstein regains 20 hit points at the start of his turn if he has at least 1 hit point and isn’t in running water or sunlight. If he takes radiant damage or damage from holy water, this trait doesn’t function at the start of his next turn.

Spellcasting. Vlad Von Carstein is a 9th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 18, +10 to hit with spell attacks). He has the following wizard spells prepared:

Cantrips (at will): mage hand, prestidigitation, ray of frost

1st level (at will):fog cloud

2nd level (5 slots): detect thoughts, gust of wind, mirror image

3rd level (4 slots): animate dead, nondetection

4th level (3 slots): blight, greater invisibility

5th level (1 slot): animate objects, scrying

Spider Climb. Vlad Von Carstein can climb difficult surfaces, including upside down on ceilings, without having to make an ability check.

Vampire Weaknesses. Vlad Von Carstein has the following flaws:

Forbiddance. He can’t enter a residence without an invitation from one of the occupants.

Harmed by Running Water. He takes 20 acid damage if he ends his turn in running water.

Stake to the Heart. If a piercing weapon made of wood is driven into his heart while he is incapacitated in his coffin, he is paralyzed until the stake is removed.

Sunlight Hypersensitivity. While in sunlight, Vlad Von Carstein takes 20 radiant damage at the start of his turn, and he has disadvantage on attack rolls and ability checks.

Ring of Carstein. Upon death Vlad Von Carstein's soul is stored in the ring he wears and will be resurrected 1d4 years later.

Multiattack.  Vlad Von Carstein makes two attacks, only one of which can be a bite attack.

Blood Drinker. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage plus 14 (4d6) necrotic damage. As a bonus action you may gain the necrotic damage dealt as HP. 

Charm. Vlad Von Carstein targets one humanoid he can see within 30 feet of him. If the target can see Vlad Von Carstein, the target must succeed on a DC 17 Wisdom saving throw against this magic or be charmed. The charmed target regards Vlad Von Carstein as a trusted friend to be heeded and protected. The target isn’t under Vlad Von Carstein's control, but it takes Vlad Von Carstein's requests and actions in the most favorable way..

Each time Vlad Von Carstein or his companions do anything harmful to the target, it can repeat the saving throw, ending the effect on itself on a success. Otherwise, the effect lasts 24 hours or until Vlad Von Carstein is destroyed, is on a different plane of existence than the target, or takes a bonus action to end the effect.

Children of the Night (1/Day). Vlad Von Carstein magically calls 2d4 swarms of bats or swarms of rats, provided that the sun isn’t up. While outdoors, Vlad Von Carstein can call 3d6 wolves instead. The called creatures arrive in 1d4 rounds, acting as allies of Vlad Von Carstein and obeying his spoken commands. The beasts remain for 1 hour, until Vlad Von Carstein dies, or until he dismisses them as a bonus action.

Vlad Von Carstein 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. Vlad Von Carstein regains spent legendary actions at the start of his turn.

Move. Vlad Von Carstein moves up to his speed without provoking opportunity attacks.

Blood Drinker.(Costs 2 Actions) Vlad Von Carstein makes one Blood Drinker attack with the bonus action perk.