Kuinshi

Kuinshi are the only known natural predator a Vampire has, though one could say that they're the ultimate predator due to the simple fact they can feed off anything around them so long as it is living. The Kuinshi is one might say in a state of constant leeching off the people and world around them unless they choose to actively curtail this by keeping their metaphysical hands to themselves in a manner of speaking, though despite this active refraining from draining what's around them, there is always an almost insignificant pull still on the living energy of their environment and those around them. It is due to this that they live in small clans of no more than twenty and there is never more than one clan living within 600 sq miles of each other.

Kuinshi have one major weakness however in that if their senses are overloaded with spiritual energy and power, those senses will shut themselves off, rending the kuinshi just as human and defenseless as they were before their people had been changed. Most kuinshi will not bother anything that is greater than a vampire in power due to this because most creatures which are greater in power than vampires will trigger this defense and put them in a very vulnerable position.

The race started out humans who knew of vampires and sought to keep them from harming humanity or growing out of hand. A god who's name has been lost to time found them and decided to aid them in their efforts by changing their nature as well as how they could hunt their targets, thus creating the first and only real predator for vampires.