Captain Catacomb

Regeneration. Captain Catacomb regains 10 hit points at the start of its turn if it has at least 1 hit point and isn't in sunlight. If Captain Catacomb takes radiant damage or damage from holy water, this trait doesn't function at the start of Captain Catacomb's next turn.

Spider Climb. Captain Catacomb can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Vampire Weakness. Captain Catacomb has the following flaws: Forbiddance. Captain Catacomb can't enter a residence without an invitation from one of the occupants. Stake to the Heart. Captain Catacomb is destroyed if a piercing weapon made of wood is driven into its heart while it is incapacitated in its resting place. Sunlight Hypersensitivity. Captain Catacomb takes 20 radiant damage when it starts its turn in sunlight. While in sunlight it has disadvantage on attack rolls and ability checks.

Spellcasting. Captain Catacomb is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC13, 5 to hit with spell attacks). Captain Catacomb has the following wizard spells prepared: 

Cantrips (at will): chill touch, mage hand, dancing lights, prestidigitation

1st level (4 slots): false life, mage armor, fog cloud

2nd level (3 slots): darkness, misty step, ray of enfeeblement

3rd level (2 slots): animate dead, vampiric touch

Multiattack. The vampire makes two attacks, only one of which can be a bite attack.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one willing creature or a creature that is grappled by the vampire, incapacitate, or restrained. Hit: 6 (1d6 + 2) piercing damage plus 7 (2d6) 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 it's hit point maximum to 0.

Cutlass. Melee Weapon Attack.  +5 to hit, reach 5ft., one creature. Hit:  7 (2d4+2 slashing damage. Instead of dealing damage, Captain Catacomb can grapple the target (Escape DC 13 Athletics or Acrobatics)

Captain Catacomb 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. Captain Catacomb regains spent legendary actions at the start of its turn.

Move.  Captain Catacomb moves up to its speed without provoking opportunity attacks.

Cutlass. Captain Catacomb makes one attack with his pirate cutlass.

Bite (2 actions). Captain Catacomb makes one bite attack.