Multiattack

One Bite and two Claws. If vanguard hits one target with both Claws target must make DC 15 Con save or take 7 (2d6) slashing damage and vampire regains hp equal to that amount.

Bite

Melee Weapon Attack: +7 to hit, 5 ft., one creature,. 13 (2d8+4) piercing damage + 7 (2d6) necrotic. Target's hp max is reduced by an amount equal to necrotic taken and vampire regains hp equally. Reduction lasts until target finishes a long rest. Target dies if this reduces its hp max to 0.

Claw

Melee Weapon Attack: +7 to hit, 5 ft., one target, 11 (2d6+4) slashing damage.