Kyuubi no kitsune Hunter

Kyuubi no kitsune Hunters are people that possess powers that are passed down through their family's generations.

Origins
It's unknown of where Kyuubi no kitsune Hunters come from.

Kyuubi no kitsune Hunter Curse
This has also created a curse on Kyuubi no kitsune hunters. They can never have twins because the twins will consume each other in the womb and will be stillborn. In rare cases, the stronger twin will consume the other in the womb and be born as a very strong vampire hunter. Twin birth is extremely rare, and while one twin will be very strong, the other will generally be sickly and weak, and will serve little use as a hunter. For the pair to become powerful hunters, the stronger one has to devour the other and become one. The vampire hunter twins are known as 'The Cursed Twins'.