Violetta, the Vampire of the Cesspit

Shapeshifting Master. Along with the ability to transform into a bat or a cloud of mist via a vampire's Shapechanger trait (See Vampire), Violetta is also able to utilize Alter Self at will to change into any humanoid creature indistinguishable from the original as long as she isn't in sunlight or in contact with water.

Dual Nature.  Violetta is considered both an ooze and an undead.

Amorphous. Violetta can squeeze through a space as narrow as one inch wide, provided she has nothing equipped.  She has advantage on ability checks to initiate or escape a grapple.

Corrupted Mass.  Coming into contact with organic material can cause it to degrade, causing a cumulative -1 Penalty to organic weapons or armor upon contact. If the penalty reaches -5 the weapon is destroyed. However, due to her vampiric nature, silver/silvered weapons and armor is immune to this effect.

Legendary Resistance (3/Day). If the vampire fails a saving throw, it can choose to succeed instead.

Misty Escape. When Violetta drops to 0 hit points outside her resting place, she transforms into a cloud of mist (as in the Shapeshifting Master trait) instead of falling unconscious, provided that she isn’t in sunlight or running water. If she can’t transform, she is destroyed.

While she has 0 hit points in mist form, she can’t revert to her vampire form, and she must reach her resting place within 6 hours or be destroyed. Once in its resting place, it reverts to her blob form. She is then paralyzed until she regains at least 1 hit point. After spending 1 hour in her resting place with 0 hit points, she regains 5 hit points.

Regeneration. Violetta regains 25 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 she 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.

Spellcaster.  Violetta is a 20th Level spellcaster.  Her Spellcasting ability is intelligence (spell save DC 23, + 14 to hit with spell attacks) and can cast Alter Self and Command at will. Violetta has the following Wizard Spells prepared:

Cantrips (at will): Ray of Frost, Shocking grasp, Mind Sliver, Poison Spray

1st level (at will):  Chromatic Orb, Fog Cloud, Thunder Wave

2nd level (3 slots): Misty Step, Blindness/Deafness, Invisibility, Shatter

3rd level (3 slots): Counterspell, Lightning Bolt, Vampiric touch, Bestow Curse

4th level (3 slots): Ice Storm, Hallucinatory Terrain, Blight

5th level (3 slots): Dominate Person, Planar Binding, Immolation

6th level (2 slots): Mass Suggestion, Soul Cage

7th Level (1 slot): Draconic Transformation, Teleport

8th Level (1 slot): Antipathy/Sympathy, Maddening darkness

9th level (1 slot): Weird

Vampire Weaknesses. Violetta has the following flaws:

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

Harmed by water. Violetta takes 1d6, 3d6, or 12d6 damage if she comes in contact with water, damage depends on level of contact (For example, Light rain deals 1d6, torrential rain deals 3d6, full submersion deals 12d6)

Soft glow.  Violetta's body produces a dim light within a 30ft radius, giving her a stealth disadvantage in dark areas unless under the effect of Alter Self or Invisibility

Sunlight Hypersensitivity. Violetta takes 25 radiant damage when she starts her turn in sunlight. While in sunlight, it has disadvantage on attack rolls and ability checks.

Low Mass.  When Violetta is below 20% health, she will be forced into a smaller from in the shape of a blob, forcing her size to tiny.  In this form the following effects are applied to her:

• She can no longer cast spells that require a material and somatic component.
• She drops everything she has equipped.
• Once she reaches above 20%, she can use an action to revert back into her Vampire form
• She is unable to shapeshift into anything except her bat or mist form.
• She can only make Bite attacks on Charmed targets.

Power of the Unliving. (Recharges after a Short or Long Rest) If Violetta would've been reduced to 0 health, her health resets to 280 hit points instead. Violetta restores all uses of Legendary Resistance and can use her Mythic Actions as Legendary actions.  Additionally, her move and flight speed is doubled, and she can use her Mythic actions as Legendary actions.

Power of the Unliving lasts for 1 hour, defeating her when this is active will reward an additional 75,000 XP (150,000 total)

Multiattack. (Vampire Form Only). Violetta makes two attacks, only one of which can be a bite attack or a spell if she can cast one.

Unarmed Strike (Vampire Form Only). Melee Weapon Attack: +11 to hit, reach 5 ft., one creature. Hit: 19 1d8+6 Bludgeoning damage and 1d6+6 slashing damage. Instead of dealing damage, Violetta can grapple the target (escape DC 21).

Bite. (Bat, Vampire, or Blob Form Only). Melee Weapon Attack: +11 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the vampire, incapacitated, or restrained. Hit: 13 (2d6 + 6) 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 her control. 

Charm. Violetta targets one humanoid it can see within 30 feet of it. If the target can see her, the target must succeed on a DC 21 Wisdom saving throw against this magic or be charmed by her. The charmed target regards Violetta 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.

Each time the vampire or the vampire’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 the vampire is destroyed, is on a different plane of existence than the target, or takes a bonus action to end the effect.

Royal Protection. (1/Day) Violletta magically calls 2-3 vampire spawn to assist her in battle, showing up in 1d4 rounds. Additionally, the spawn receive a temporary 5d4 hit points.

Violetta 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. She regains spent legendary actions at the start of her turn.

Move. Violetta moves up to her speed without provoking opportunity attacks.

Unarmed Strike. Violetta makes one unarmed strike.

Bite (Costs 2 Actions). Violetta makes one bite attack.

At-Will Spell. Violetta casts an at will spell.

If Violetta's Power of the Unliving trait has activated in the last hour, she can use the following as Legendary Actions:

 Sanguine Glyph. (3 actions, Recharge 4-6) Violetta marks a creature within 60ft with a dark glyph with ominous markings.  The glyph eats away at the target physically and mentally, dealing 1d8 necrotic damage (1d6 for non-humanoid creatures) every turn the marked target makes, the target can make a WIS save to remove the effect (DC 21). The effect increases by one dice for every saved fail, and should any creature die from this effect (including non-humanoid creatures), they will resurrect as a vampire spawn within 2 (1d4) minutes.

Feeding Frenzy (2 actions, Bat form only) In Bat form, Violetta can latch onto the neck of a humanoid target within flying range and begin draining the life out of them, dealing an initial 13 (2d6+6) piercing damage.  The humanoid is Grappled until the creature dies or Violetta is pulled off by the target or another creature via a STR save (DC19).  Every time the grappled humanoid fails the save, 3d6 necrotic damage is taken and reduces the target's max hit points by the same amount until Violetta is pulled off, she also regains health equal to damage done.  If the target dies to this effect, then buried in the ground they will rise as a vampire spawn under her control the following night.