WHAT YOU KNOW:

In the beginning there was nothing.  An empty void, an endless expanse of nothingness.  This was the first age, the Tlayoalli Cahuitl.  The Tlayoalli Cahuitl went on for a long time, until eventually a spark of chaos stirred the nothingness and created the first being, a god named Ometecuhtli.  Ometecuhtli's birth began the second age, the Ometecuhtli Cahuitl.  Ometecuhtli was the embodiment of everything that was.  It was both male and female, both good and evil, both light and darkness, etc.  However, Ometecuhtli was not the embodiment of everything that ever will be.  Thus, Ometecuhtli felt the need to give birth to new life, which it could because it embodied both male and female (aztec shit, don't ask).  However, Ometecuhtli died shortly after this great birth, and his corpse became the world you live in.  His children were the gods of the Aztlanic pantheon - Camazotz, Xolotl, Mictlantecuhti, etc.  Ometecuhtli's death and the gods' birth thus heralded the beginning of the third age - the Teotl Cahuitl.  The gods lived on the corpse of their parent, and while they were content for a time they eventually grew bored.  To pass the time they decided to give birth to children of their own, and from the earth they used their mighty powers to create a variety of beasts and critters, most notably the tlacatl.  Sculpted from the earth, the Tlacatl was the gods' first attempt to create a being in their image, but it was imperfect.  The creation of the tlacatl marked the arrival of the fourth age, the Yaoyotl Cahuitl, and it would be a time of strife and fighting amongst the gods, as each god had ideas about how to make the Tlacatl perfect.  However, the most bitter fighting could be had between the dark god Camazotz and the goddess of beasts Xolotl.  Xolotl fused the beasts of the world with the tlacatls, creating beastmen of all shapes and sizes.  This made Camazotz incredibly jealous, as he could not create, he could only destroy.  Thus in a fit of envy Camazotz attacked his sister Xolotl, and in the chaos the dark and tainted blood of Camazotz was spilled onto the tlacatls.  The tlacatls immediately died, but interestingly they did not remain dead.  They instead rose from their deathly slumber, no longer needing to eat or sleep but thirsting for blood.  Thus the Aztlanic vampire was born (It is said that the vampire nobles absorbed more of this blood than the others, thus leading to them taking on forms similar to their father).  The vicious fighting between the gods led to a furious contest to see whose creation was best, and whose creation could top that of the mighty Camazotz, and as a result many different races were created - orcs, humans, etc. - until there were no tlacatls left.  Eventually the gods grew tired of fighting and upon seeing their myriad creations they finally were satisfied with their work.  Thus they left the corpse of their father for their creations to inherit and moved to the heavens, parting the nothingness to make their respective domains from which they rule this world.  The departure of the gods to their respective realms marks the beginning of the Mocahuilia Cahuitl, the fifth and current age of the world.

VAMPIRE CREATION

It is common knowledge that all vampires were created in the manner described above but you know from your priestly days that there is a temple deep beneath Macuahuitlan, heavily guarded and hidden from the average vampire.  It is called the Temple of Birth and none are allowed inside except when the doors glow red, at which time a new vampire is born.  No vampire has seen the process of birth but none dispute that it is the work of Camazotz providing more servants to carry out his bidding.  (Note that you didn't get to go inside the Temple but you know where it is.  You also know that the Chamber of Birth past the temple doors lies at the end of a maze that no one bothered to guide you through that's full of traps and monstrosities waiting to take the life of any foolish enough to enter these hallowed halls without being invited inside, not to mention the elite Aztlanic troops that stand guard outside)