Vampires
Orginals:
These are the original vampires. They are incapable of appealing as human. They must drink blood to survive. Any blood will work. Animal blood is the worst tasting. Human blood is the sweetest like cake. The various supernatural species all taste good but can range from being like vegetables to steak. They are capable of having children. An original vampire and a human will produce a half blooded vampire. A child produced with any supernatural being will produce an original vampire, unless the supernatural being is half blooded. Can not turn other creatures into a vampire of any type.
Half Bloods:
A male original vampire and human female engaging in sexual congress will always result in pregnancy no matter what. A female original vampire and a human male will result in a pregnancy about 50% of the time. Half bloods have all the powers and weaknesses of an original vampire they are just not as strong. Has the possibility of turning humans into half bloods through a process called siring but informally referred to as turning. Capable of getting other half bloods and humans pregnant any children produced will always be half blooded. Pregnancy happens about the same rate as pregnancies between two humans. They can appear human.
Sired Vampires:
Identical in every way to half bloods but born human. The body they have at the moment they turn is the body they will have for the rest of their life. If they are fat they will always be fat. Anything but a perfect specimen that is turned will be shunned from vampiric society.
Dhampir:
A pregnant human who is bit and turned into a vampire will produce a dhampir. All the strengths of a half blood none of the weaknesses. They still must consume blood but animal blood will not sustain at all. Consumption of animal blood results in a violent almost allergic reaction, such as diarrhea, vomiting, blood tears, even death. They protect their half blooded masters while they sleep during the day. They always appear human looking.
Slayers:
How Slayers came about no one knows. All anyone knows is that they have the strength of a vampire and they have the most desirable blood of all known supernatural beings. A vampire who drinks this blood will become obsessed with finding more Slayers to drink. Slayers can only be produced by two humans. Especially if they are descended from Abraham Van Helsing the most legendary vampire hunter to exist. They are compelled to defend humanity from the supernatural especially vampires. They can feel it in their blood when near a vampire. They always appear human looking.
Notes: With the exception of Slayers and Dhampirs all vampire types are just called vampires. Referring to any of them as half blooded is an insult.
History:
Around a a millennia ago a disease spread among the original vampires that killed all but ten percent of them. Those that survived were sterilized and severely weakened. They were actually weaker than half blooded vampires. The vampiric community up till that point was lead by original vampires only. A young and highly ambitious half blooded vampire known as Dracula saw an opportunity to take power. He gathered other half bloods and led a violent coup and overthrew their full blooded masters wiping them all out. Dracula the strongest of all the half blooded vampires leads the vampires to this day.
The vampiric community is split on whether Dracula did the right thing or not. About half believe that it was only a matter of time that the original vampires would have died out anyway due to their weakened state. If they are right many half bloods, sired, and dhampirs died for nothing.