In a world where the supernatural rules everything, humans are used as blood bags and slaves, and everything seems to be at peace. Failures are used as pets, to keep their owners company. Failures were first test subjects to the humans, decades ago when they were still in control, to be used as war weapons against a neighboring country, then, the humans lost control of their world, the supernatural creatures took over when they declared a few of their test subjects 'Failures', for not being able to destroy what they needed to be destroyed. Then the Failures escaped and made their population grow, grow to the point where they are snatched up by catchers and sold as pets.
Now, there are two Failures that have been called legends, they were taken away from their Clan, and adopted by royalty, what they did to earn the title as Legends, is something no one has ever done, and only happened by fate.