Vampire Spawn, Mind Drinker

Regeneration. The vampire regains 10 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.

Unusual Nature. The vampire doesn't require air.

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 when it ends its turn in running water.

Stake to the Heart. The vampire is destroyed if a piercing weapon made of wood is driven into its heart while it is incapacitated in its resting place.

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.

Multiattack. The vampire makes two Claw attacks. It can replace one Claw attack with one Bite attack.

Bite. Melee Weapon Attack: +6 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.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 8 (2d4 + 3) slashing damage, plus 5 (2d4) psychic damage. Instead of dealing damage, the vampire can grapple the target (escape DC 14).

Mind Siphon (Recharge 5–6). The vampire targets a creature it can see within 30 feet of it. The target must make a DC 14 Intelligence saving throw, with disadvantage if the vampire has previously consumed the target's blood. On a failed save, the target takes 28 (8d6) psychic damage, and the vampire discerns the target's surface emotions and thoughts. On a successful save, the target takes half as much damage, and the vampire discerns the target's general emotional state but not its thoughts.

Spellcasting (Psionics). The vampire casts one of the following spells, requiring no material components and using Intelligence as the spellcasting ability (spell save DC 14):

At will: message

3/day each: charm person, hold person, mirror image, sleep

1/day each: gaseous form, major image

Shadow Stealth. While in dim light or darkness, the vampire can take the Hide action.