Multiattack

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

Grab

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) bludgeoning damage. The target is grappled (escape DC 14).

Bite

Melee Weapon Attack: +6 to hit, reach 5 ft., one target that is grappled incapacitated restrained or willing. Hit: 9 (1d10 + 4) piercing damage plus 14 (4d6) necrotic damage. The targets hit point maximum is reduced by an amount equal to the necrotic damage dealt and the vampire regains this number of hit points. The reduction lasts until the target finishes a long rest. If the target is reduced to 0 hit points by this attack it dies.