Vampire

A vampire is a Carnivore animal that can absorb lifeforce from non-vampire animals by drinking their blood, which has lifeforce flowing through it.

Transmission
The Harvest, or Vampirism, is variously called a gift, curse, or disease. It is passed on from a Dragon to any other Carnivore species, who becomes a pure vampire. A pure vampire can mate with another to give birth to a pure vampire.

The form of vampirism which gives most lifeforce, as well as the most satisfactory to the vampire, is killing, or full-biting. All of the lifeforce is drunk from the body. This is not all of the blood, but only a fraction of it which is lifeforce-rich, about a bowl of soup worth.

But fully harvesting a victim can take a long time, sometimes hours. In order to be quick, many vampires will half-bite, that is, only drink blood for a few minutes. If they drink 3/4ths or more of the victim's lifeforce, the victim will become a vampire.

Most animals do not distinguish between those who have the ability, and those who use it. Usually, they are all Vampires, practicing or non-practicing.

Originally Gifted (OG)
All types of Dragons (including Therians and Dragonborn) have the Harvest. Every Dragon is a pure-blood vampire, but most of them do not use their power.

Pure-blood
When a Carnivore is half-bitten by a Dragon, they become a pure vampire. A pureblood can also mate with another to give birth to create a new pureblood. The condition cannot be removed or cured, but the cravings can be kept at bay, albeit in an unsatisfactory manner, by drinking the dead blood of wild animals.

Pure-bloods are exempt from being required to drink blood, but unlike Dragons, have strong cravings. Their life expectancy is half the average.

Half-blood (disparaging: mud-blood)
When a Carnivore is half-bitten by a pureblood or halfblood, they become a halfblood. All half-bloods are infertile and have greatly reduced lifespan. They must drink 120 points of lifeforce every month. This is equivalent to one kill, or about four half-bites. A halfblood will die after 1 month without blood.

Unlike purebloods, halfbloods can be cured, but it is an expert spell, and quite expensive to cast.