We have a version of the Jade Court of vampires. It is a coalition of mages (wizards, sorcerers, focused practitioners... anybody who have a bit of magic, but not general Minor talents), who were infested with something evil. During a day, JCVs function like an ordinary humans - like they were before the infestation. The best pretenders managed to remain uncovered and work to lure other Gifted into traps. But after the dusk JCVs gain Inhuman (or even stronger) stats, magic resistance and vulnerability to Jade.
Their best weapon is a conspiracy. They are almost undetectable during a day, and very dangerous during a night. Ancient JCVs are extremely dangerous: they feed on magic. Actually, JCVs have two ways of dealing with their victims: eating and embracing.
Eating means killing helpless or immobilized mage by winning a mental battle during a night. The mage does not gain an opportunity to cast a Death curse, because the vampire devours his victim's magic ability and assimilate it. If the vampire had full wizard's abilities, and the victim had the same, the vampire gains Refinement. If the vampire had full wizard abilities, but the victim was only a focused practitioner, the vampire gains only boost in the victim's field. But if the vampire was a focused practitioner, and the victim was a wizard... the vampire became a wizard instead. So, through time, JCVs can be very powerful.
Instead of eating mages, JCVs can make them JCVs. To do so, after winning the mental combat, JCV must give the victim's powers back to their original host. But the powers are already corrupted, infested with a spirit of the Hungry Dead. The High Concept of the victim immidiately changes in order to represent his vampirehood, and he became a monster.
Jade Court Vampires became the greatest threat for my campaign, because it's events take place in Vancouver, British Columbia, and there are a lot of practitioners and Chineese and very few wizards. PCs gathered a lot of allies and have made a lot of bad contracts to bring an army to the vampire's doorstep. The outcome of the final battle is not defined... until our next session.