Depende de qual ataque mata e o HD da vítima

Destacando os principais pontos aqui.

Create Spawn (Su)

A humanoid or monstrous humanoid slain by a vampire’s energy drain rises as a vampire spawn 1d4 days after burial.

If the vampire instead drains the victim’s Constitution to 0 or lower, the victim returns as a spawn if it had 4 or less HD and as a vampire if it had 5 or more HD. In either case, the new vampire or spawn is under the command of the vampire that created it and remains enslaved until its master’s destruction. At any given time a vampire may have enslaved spawn totaling no more than twice its own Hit Dice; any spawn it creates that would exceed this limit are created as free-willed vampires or vampire spawn. A vampire that is enslaved may create and enslave spawn of its own, so a master vampire can control a number of lesser vampires in this fashion. A vampire may voluntarily free an enslaved spawn in order to enslave a new spawn, but once freed, a vampire or vampire spawn cannot be enslaved again.

Os ataques em questão são a drenagem de sangue

Blood Drain (Ex)

A vampire can suck blood from a living victim with its fangs by making a successful grapple check. If it pins the foe, it drains blood, dealing 1d4 points of Constitution drain each round the pin is maintained. On each such successful attack, the vampire gains 5 temporary hit points.

E drenagem de energia

Energy Drain (Su)

Living creatures hit by a vampire’s slam attack (or any other natural weapon the vampire might possess) gain two negative levels. For each negative level bestowed, the vampire gains 5 temporary hit points. A vampire can use its energy drain ability once per round.

Então, em suma, se você matar por morder (Drenagem de Sangue) e o PC estiver no nível 5 ou mais alto, você receberá um vampiro em 1d4 dias no solo. Caso contrário, você recebe um vampiro spawn. Mas a chave aqui é que a vítima deve MORRER dos ataques do vampiro e ser enterrada. Apenas ser beijado não faz de você um vampiro. Se um PC morrer, a festa pode impedi-lo de girar apenas por não colocá-lo no chão.

Todas as citações tiradas da entrada Vampire no SRD.

Você pode encontrar as regras para Vampiros no Livro dos Monstros ou no SRD . As regras de como eles criam novos vampiros são mostradas sob a habilidade Create Spawn :

Create Spawn (Su)

A humanoid or monstrous humanoid slain by a vampire’s energy drain rises as a vampire spawn 1d4 days after burial.

If the vampire instead drains the victim’s Constitution to 0 or lower, the victim returns as a spawn if it had 4 or less HD and as a vampire if it had 5 or more HD. In either case, the new vampire or spawn is under the command of the vampire that created it and remains enslaved until its master’s destruction. At any given time a vampire may have enslaved spawn totaling no more than twice its own Hit Dice; any spawn it creates that would exceed this limit are created as free-willed vampires or vampire spawn. A vampire that is enslaved may create and enslave spawn of its own, so a master vampire can control a number of lesser vampires in this fashion. A vampire may voluntarily free an enslaved spawn in order to enslave a new spawn, but once freed, a vampire or vampire spawn cannot be enslaved again.

Eu destaquei as partes principais; morder e drenar uma vítima de sangue criará um Vampiro se o NPC for poderoso o suficiente (a maioria não é) enquanto ou esmurrando até a morte ou drenando o sangue de um NPC fraco irá criar um Spawn de Vampiro.

De qualquer maneira, o alvo precisa ser enterrado e, em seguida, leva alguns dias para que ele suba.