From Pathfinder Bestiary 2, which isn't enabled.

Vrykolakas Spawn

CREATURE 6

Vrykolakas unleash their spawn upon the world to spread terror, plague, and suffering and to draw attention away from their masters.

Perception +14; darkvision

Languages Common

Skills Acrobatics +14, Athletics +15, Stealth +14, Survival +11

Str +5, Dex +4, Con +2, Int -3, Wis +2, Cha +2

AC 24; Fort +14, Ref +16, Will +12

HP 99, void healing; Immunities death effects, disease, paralyzed, poison, sleep

Feral Possession (curse, divine, incapacitation, mental, possession)

Trigger The vrykolakas is reduced to 0 Hit Points, and an animal is within 100 feet

Effect Unlike most other undead, a vrykolakas isn't destroyed when it reaches 0 HP. Instead, it attempts to cast its spirit into an animal within 100 feet, which must attempt DC 24 Will save. On a failure, the animal is possessed. This has the effects of the Possession spell, but it lasts a number of days equal to the vrykolakas's level. This possession can't be counteracted with magic (though remove curse works against it normally).

If the animal succeeds at its save, the vrykolakas can attempt to possess a different animal within 100 feet. If at any point an animal critically succeeds at its save or no animal is within 100 feet, the vrykolakas fails to possess anything and is destroyed.

A vrykolakas possessing an animal seeks out its burial site (see Burial Site Bound below) immediately, burying itself there. While the vrykolakas is in this state of recovery, its animal host is Paralyzed, and beheading it destroys the vrykolakas and kills its host. Removing the curse destroys the vrykolakas and returns the animal to normal.

After 1d4 days, if the vrykolakas hasn't been destroyed, the animal dies and the vrykolakas rises in a new body that's identical to its previous one, formed from the animal's remains.

Void Healing

A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead.

Vrykolakas Vulnerabilities

Vrykolakas all have the following vulnerabilities.

Burial Site Bound A vrykolakas is bound to the place of its death or interment. It must return to this location once per week and bury itself in the earth for 24 hours, during which time it is Paralyzed and can be beheaded. If it is unable to return to this site, it is reduced to 0 Hit Points and attempts to use Feral Corruption; if this host animal can't return to the burial site before the possession effect ends, the vrykolakas is destroyed and the animal host returns to normal.
Vulnerable to Decapitation A vrykolakas that is beheaded can't use its Feral Possession, and a beheaded corpse cannot rise as a vrykolakas.

Speed 40 feet, climb 20 feet

Melee Fangs +17, Damage 2d8+8 piercing plus Drink Blood

Melee Claw +17 (agile, unarmed), Damage 2d6+8 slashing

Drink Blood (divine)

Requirements The vrykolakas' last action was a successful fangs Strike

Effect The vrykolakas sinks its fangs into that creature to drink its blood. This requires an Athletics check against the creature's Fortitude DC. On a success, the creature becomes Drained 1, and the vrykolakas regains 10 healing HP, gaining any excess HP as temporary Hit Points.

Drinking Blood from a creature that's already drained doesn't restore any HP to the vampire, but it increases the creature's drained condition value by 1. A vrykolakas can also consume blood that's been emptied into a vessel for sustenance, but it gains no HP from doing so.

The target creature's drained condition value decreases by 1 per week.

A blood transfusion, which requires a successful DC 20 Medicine check and sufficient blood or a blood donor, reduces the drained value by 1 after 10 minutes.

Rend

Claw

A Rend entry lists a Strike the monster has.

Requirements The monster hit the same enemy with two consecutive Strikes of the listed type in the same round.

Effect The monster automatically deals that Strike's damage again to the enemy.

Pathfinder Bestiary 2OGL