Vampire

Vampires are undead shapechangers who hunger for blood.

Appearance
Vampires appear in undeath much as they did in life, but have sharp fangs.

Abilities
In D&D, vampires are able to change into either the form of a bat or a cloud of mist. Both are primarily used for escape, rather than combat. A vampire will also automatically shapeshift into a mist when dropped to 0 HP. In any corporeal form, vampires can climb vertical and upside-down surfaces without difficulty.

Vampires can automatically regain some health on their turn if they are not in sunlight and if they did not take radiant damage nor damage from holy water on their turn. They are resistant to necrotic damage and physical damage from non-magical weapons, but are sensitive to running water and sunlight. They also cannot enter residences unless invited in by an occupant, and if staked through the heart in their resting place, they become paralyzed.

If a vampire kills a humanoid with their bite, and that creature is then buried in the ground, the creature will become a vampire spawn, controlled by the vampire.

In other games (eg, Vampire: The Masquerade), vampires have different abilities, although they typically share the thirst for blood.

Known Vampires
Sylas Briarwood and Count Tylieri were both vampires that Vox Machina encountered and fought in Whitestone, along with many vampire spawn.

In the Thursday By Night One-shots, the Critical Role cast (other than Taliesin, who is the GM) play themselves as vampires using a modified version of the Vampire: The Masquerade TTRPG.