Vampire Spawn Warlock of the Undying

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 sunlight 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:

Forbiddance. The vampire can't enter a residence without an invitation from one of the occupants.

Harmed by Running Water. The vampire takes 20 acid damage if it ends its turn in running water.

Stake to the Heart. If a piercing weapon made of wood is driven into the vampire's heart while the vampire is incapacitated in its resting place, the vampire is paralyzed until the stake is removed.

Sunlight Hypersensitivity. The vampire takes 20 radiant damage when it starts its turn in sunlight. While in sunlight, it has disadvantage on attack rolls and ability checks.

Innate Spellcasting. The vampire’s innate spellcasting ability is Charisma (spell save DC 15, +7. It can innately cast the following spells, requiring no material components:

At will: false life, mage armor (self only), sending (to patron only), speak with dead

1/day: bestow curse

Spellcasting. The vampire is a 9th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 15, +7 to hit with spell attacks). The vampire spawn knows the following warlock spells:

Cantrips (at will): chill touch, eldritch blast, mage hand, spare the dying

1st-5th level (2 5th-level slots): aura of life, blight, blindness/deafness, contagion, death ward, feign death, legend lore, mirror image, ray of sickness, silence

Among the Dead. If an undead targets the warlock directly with an attack or a harmful spell, that creature must make a DC 15 Wisdom saving throw (an undead needn't make the save when it includes the warlock in an area effect). On a failed save, the creature must choose a new target or forfeit targeting someone, potentially wasting the attack or spell. On a successful save, the creature is immune to this effect for 24 hours. An undead is also immune to this effect for 24 hours if the warlock target it with an attack or a harmful spell.

Defy Death. The warlock regains 7 (1d8 + 3) when it succeeds on a death saving throw or when it stabilizes a creature with spare the dying.

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

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 7 (2d4 + 3) bludgeoning damage. Instead of dealing damage, the vampire can grapple the target (escape DC 13).

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the vampire, incapacitated, or restrained. Hit: 6 (1d6 + 3) 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 its hit point maximum to 0.