Nil

he keeps track of all the deaths of both dragons and familiars,
no dragon likes too stay around him for long hes said too bring bad luck, depression and some types of illnesses (not sever ones a bit like some stomach cramps or a soar throat) and even death.

his shady, quiet behavior doesn't help fighting off the rumors.

Nicknamed the undertaker, Nil is kept away from ill and wounded dragons, lucky he usually keeps to himself and stays in he’s nest that’s located on the outside of lair next too the grave yard, even tho all of the negative rumors the dragons actually grew to quite like and respect Nil, maybe if you do see him in your dreams or around the room if your wounded or sick will up the chances of being sick he’s also said to make those dragons pass quickly and peacefully. Some dragons actually see him as a god or king cause if his powers and his caring of the death.