Kaylan Renaudon

If Kaylan isn't in sunlight or running water, it can use its action to polymorph into a Tiny bat or a Medium cloud of mist, or back into its true form.
While in bat form, Kaylan can't speak, its walking speed is 5 feet, and it has a flying speed of 30 feet. Its statistics, other than its size and speed, are unchanged. Anything it is wearing transforms with it, but nothing it is carrying does. It reverts to its true form if it dies.
While in mist form, Kaylan can't take any actions, speak, or manipulate objects. It is weightless, has a flying speed of 20 feet, can hover, and can enter a hostile creature's space and stop there. In addition, if air can pass through a space, the mist can do so without squeezing, and it can't pass through water. It has advantage on Strength, Dexterity, and Constitution saving throws, and it is immune to all nonmagical damage, except the damage it takes from sunlight.

If Kaylan fails a saving throw, it can choose to succeed instead.

When it drops to 0 hit points outside its resting place, Kaylan transforms into a cloud of mist (as in the Shapechanger trait) instead of falling Unconscious, provided that it isn't in sunlight or running water. If it can't transform, it is destroyed.
While it has 0 hit points in mist form, it can't revert to its vampire form, and it must reach its resting place within 2 hours or be destroyed. Once in its resting place, it reverts to its vampire form. It is then Paralyzed until it regains at least 1 hit point. After spending 1 hour in its resting place with 0 hit points, it regains 1 hit point.

Kaylan regains 20 hit points at the start of its turn if it has at least 1 hit point and isn't in sunlight or running water. If Kaylan takes Radiant damage or damage from holy water, this trait doesn't function at the start of Kaylan's next turn.

Kaylan can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Kaylan has the following flaws:
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Forbiddance
Kaylan can't enter a residence without an invitation from one of the occupants.
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Harmed by Running Water
Kaylan takes 20 Acid damage if it ends its turn in running water.
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Stake to the Heart
If a piercing weapon made of wood is driven into Kaylan's heart while Kaylan is Incapacitated in its resting place, Kaylan is Paralyzed until the stake is removed.
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Sunlight Hypersensitivity
Kaylan takes 20 Radiant damage when it starts its turn in sunlight. While in sunlight, it has disadvantage on attack rolls and ability checks.

Kaylan makes two attacks, only one of which can be a bite attack.

Melee Weapon Attack +9 to hit, reach 5 ft., one creature. 8 (1d8 + 4) Bludgeoning damage. Instead of dealing damage, Kaylan can grapple the target (escape DC 18).

Melee Weapon Attack +9 to hit, reach 5 ft., one willing creature, or a creature that is Grappled by Kaylan, Incapacitated, or Restrained. 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 Kaylan 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 Kaylan's control.

Kaylan targets one humanoid it can see within 30 feet of it. If the target can see Kaylan, the target must succeed on a DC 17 Wisdom saving throw against this magic or be Charmed by Kaylan. The Charmed target regards Kaylan as a trusted friend to be heeded and protected. Although the target isn't under Kaylan's control, it takes Kaylan's requests or actions in the most favorable way it can, and it is a willing target for Kaylan's bite attack.
Each time Kaylan or Kaylan's 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 Kaylan is destroyed, is on a different plane of existence than the target, or takes a bonus action to end the effect.

Kaylan magically calls 2d4 swarms of Bats or Rats, provided that the sun isn't up. While outdoors, Kaylan can call 3d6 Wolves instead. The called creatures arrive in 1d4 rounds, acting as allies of Kaylan and obeying its spoken commands. The beasts remain for 1 hour, until Kaylan dies, or until Kaylan dismisses them as a bonus action.

Kaylan moves up to its speed without provoking opportunity attacks.

Kaylan makes one unarmed strike.

Kaylan makes one bite attack.