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Medium undead (shapechanger), lawful evil
Saving Throws Dex +9, Wis +7, Cha +9
Shapechanger. If the vampire 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.
Legendary Resistance (3/Day). If the vampire fails a saving throw, it can choose to succeed instead.
Misty Escape. When it drops to 0 hit points outside its resting place, the vampire 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.
Regeneration. The vampire regains 20 hit points at the start of its turn if it has at least 1 hit point and isn't in sun light or running water. If the vampire takes radiant damage or damage from holy water, this trait doesn't function at the start of the vampire's next turn.
Spider Climb. The vampire can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Vampire Weaknesses. The vampire has the following flaws:
Multiattack (Vampire Form Only). The vampire makes two attacks, only one of which can be a bite attack.
Unarmed Strike (Vampire Form Only). Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 8 (1d8 + 4) bludgeoning damage. Instead of dealing damage, the vampire can grapple the target (escape DC 18).
Bite (Bat or Vampire Form Only). Melee Weapon Attack: +9 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the vampire, 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 the vampire 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.
Charm. The vampire targets one humanoid it can see within 30 feet of it. If the target can see the vampire, the target must succeed on a DC 17 Wisdom saving throw against this magic or be charmed by the vampire. The charmed target regards the vampire as a trusted friend to be heeded and protected. Although the target isn't under the vampire's control, it takes the vampire's requests or actions in the most favorable way it can, and it is a willing target for the vampire's bite attack.
Children of the Night (1/Day). The vampire magically calls 2d4 swarms of bats or rats, provided that the sun isn't up. While outdoors, the vampire can call 3d6 wolves instead. The called creatures arrive in 1d4 rounds, acting as allies of the vampire and obeying its spoken commands. The beasts remain for 1 hour, until the vampire dies, or until the vampire dismisses them as a bonus action.
The vampire 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. The vampire regains spent legendary actions at the start of its turn.
Move. The vampire moves up to its speed without provoking opportunity attacks.
See 5e SRD:Vampires.
A Vampire's Lair
A vampire chooses a grand yet defensible location for its lair, such as a castle, fortified manor, or walled abbey. It hides its coffin in an underground crypt or vault guarded by vampire spawn or other loyal creatures of the night.
The region surrounding a vampire's lair is warped by the creature's unnatural presence, creating any of the following effects:
If the vampire is destroyed, these effects end after 2d6 days.
Variants: Vampire Warriors and Spellcasters
Some vampires have martial training and battlefield experience. A warrior vampire wearing plate armor (AC 18) and wielding a greatsword has a challenge rating of 15 (13,000 XP) and the following additional action options:
Multiattack. The vampire makes two greatsword attacks.
Greatsword. Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 11 (2d6 + 4) slashing damage.
Some vampires are practitioners of the arcane arts. A spellcaster vampire spellcaster has a challenge rating of 15 (13,000 XP) and the following trait:
Cantrips (at will): mage hand, prestidigitation, ray of frost
Characters as Vampires
The game statistics of a player character transformed into a vampire spawn and then a vampire don't change, except that the character's Strength, Dexterity, and Constitution scores become 18 if they aren't higher. In addition, the character gains the vampire's damage resistances, darkvision, traits, and actions. Attack and damage rolls for the vampire's attacks are based on Strength. The save DC for Charm is 8 + the vampire's proficiency bonus + the vampire's Charisma modifier. The character's alignment becomes lawful evil, and the DM might take control of the character until the vampirism is reversed with a wish spell or the character is killed and brought back to life.