SPECIES RUNDOWN

All Demons were once people. the earliest demons were humans who struck a deal with the devil and didnt pay on their end. therefore they were dragged to hell by satan's hell-hounds and soon evolved as time went on. the pure blood demons are usually called Greater Demons because of the fact that their blood-line can be traced as far back as the first "bred" demons in hell. Demons can breed with just about anything, other than vampires and werewolves. When a Greater Demon breeds with something other than another Greater Demon, their offspring are half-blood, meaning they will only become Lesser Demons; they have mixed blood and will not be able to prune their bloodline from there on unless they breed with another Lesser Demon or if they can, a Greater Demon. If they breed with a Lesser Demon, their children will still be Lesser until they have their kids, and so on. For a Lesser Demon bloodline to become pure, nearly six generations must pass. If they breed with a Greater Demon, the bloodline will become pure in nearly four generations. In general, all demons can heal semi-quickly because they arent fully human. They have slightly faster reflexes, and they are quicker than a regular human. But they are not super strong.

Greater Demons cannot be killed with an exorisism. Because their bloodline is so pure, the only way to kill them is to cut their head off, and rip their heart out and chop it into bits. Burn both the heart and head in the same place, and leave the body to decompose or burn seperatly. Another way to kill a Greater Demon, drop them into a basin of boiling Holy Water. It'll burn their skin off and attack their blood, therefore attacking their heart straight on and burning it from the inside out. Most of the time this works, but when it doesnt, cut its heart out and slice it up and burn it. The body will be too weak and tortured to heal quickly.
Lesser Demons can be killed easily. A strong exorisism, holy water poured down their throat, and cutting their heads off. Because they're half human (basically) almost anything other than regular bullets can kill them.

Pureblood Vampires are the ones that were turned many many centuries ago. There are only about seven left in the whole world. Since they were here long before mortals and werewolves, they have a much easier bloodline to trace back. Vampires were once humans, but because they have been here for so long, no one has ever gotten a real story of how the Vampires really came to be. Vampires are mainly attractive beings who will age extremely slowly from the time they are around mortal years of 24. After that, it'll take about fifty years or so to age two mortal years. Thats for the pureblood vampires anyways, who have to drink human blood three times a month to keep the state of body and mind in place.
Half Blood Vampires are a little different. They are the offspring of a vampire and something else (other than an angel, demon or werewolf) or by another Half-Blooded vampire. They age relativly slow, but can die a natural death depending on the other species. Because they are only half vampire they have to feed on human only twice a month, and can sustain themselves on animal blood is the need arises - but its frowned upon and therefore rarely happens. They are the same as any other Prueblood Vampire in a sense that they are good looking and so on.

Since Vampires have been around for so long, they are both the easiest and hardest thing to hunt. A stake to the heart will damage them for a while, but because they are fast healers and dont really have a heart, it does close to nothing. Beheading a vampire will kill it - the brain that keeps the body alive has been cut off from anything, and so its automaticall dead. Sunlight cannot kill either Pureblood or Half Blood vampires. Garlic, Crosses and the myth-like things, will not kill them but injure them. Please keep this in mind.