Bela Dimitrescu

Regeneration (Humanoid form only). Bela regains 20 hit points at the start of her turn if she has at least 1 hit point and hasn't been affected by cold damage this turn. If she takes frost damage, this trait doesn't function at the start of her next turn.

Swarm (Swarm form only). The swarm can occupy another creatures space and vice versa. The swarm can't regain hit points or gain temporary hit points.

Shapechange. If Bela hasn't been affected by cold damage this turn, she can use her action to polymorph into a swarm of Hellwasps, or back into her true form. While in swarm form she has a flying speed of 30 feet. Her statistics, other than his size and speed, are unchanged. Anything she is wearing transforms with her, but nothing she is carrying does. 

Sickle Slash(only in humanoid form). Melee Weapon Attack: +  to hit, reach 5ft. If the target is a creature other than an undead or a construct, it must succeed on a DC 12 Constitution saving throw or lose 5 (1d10) hit points at the start of each of its turns due to a deep laceration . Each time the Bela hits the wounded target with this attack, the damage dealt by the wound increases by 5 (1d10). Any creature can take an action to stanch the wound with a successful DC 12 Wisdom (Medicine) check. The wound also closes if the target receives magical healing.

Unarmed Strike (Humanoid Form Only). Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 8 (1d8 + 4) bludgeoning damage. Instead of dealing damage, Bela can grapple the target (escape DC 18).

Bite (Humanoid Form Only). Melee Weapon Attack: +9 to hit, reach 5 ft., one willing creature, or a creature that is Grappled by Bela, Incapacitated, or Restrained. Hit: 7 (1d6 + 4) piercing damage plus 10 (3d6) necrotic damage. The target's hit point maximum is reduced by an amount equal to the necrotic damage taken, and Bela regains Hit Points equal to that amount. The reduction lasts until the target finishes a Long Rest. The target dies if this Effect reduces its hit point maximum to 0. A Humanoid slain in this way and then buried in the ground rises the following night as a Vampire Spawn under the vampire's control. 

Multiattack(only in swarm form). The swarm makes two Stings attacks. 

Stings(only in swarm form). Melee Weapon Attack: +7 to hit, reach 0 ft., one creature in the swarm’s space. Hit: 12 (2d6 + 5) piercing damage, or 6 (1d6 + 3) piercing damage if the swarm has half of its hit points or fewer. The target must make a DC 15 Constitution saving throw. On a failed save, it takes 21 (6d6) poison damage and is poisoned until the end of its next turn. On a successful saving throw, it takes half as much poison damage and is not poisoned.