Misty Escape. When the vampyre has been reduced to 0 hitpoints, it falls to 1 hitpoint instead. It turns into a cloud of mist, which can move at a rate of 30 ft per round (flying). This cloud is immune to all damage and conditions. It will return to its coffin in Darkmeyer, where it will re-coalesce into physical form and receive the incapacitated condition for 1 hour. After that, it will regain all of its hitpoints.

If he is attacked while in his coffin and damaged, he will be permanently slain.

Its misty escape ability will be negated if he has taken damage from a Guthix Balance potion within the past minute. In this case, if it drops to 0 hitpoints, it will simply die.

Unholy Resistance. The vampyre is immune to all damage that is not dealt by a silvered weapon or by a spell cast through a silvered spellcasting focus.

Holy Vulnerability. This creatures takes damage from Guthix Balance potions, which also negate its Misty Escape ability.

Sunlight Vulnerability. In direct sunlight, this creature takes 10 radiant damage at the start of each of its turns, and it has disadvantage on attack rolls and ability checks.

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

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 8 (2d4 + 3) slashing damage. Instead of dealing damage, the vampyre can grapple the target (escape DC 13).

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the vampyre, 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 vampyre 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.