Devon is a In a word, vampires. There are two branches of Night-Children, but both stem from Notte, as he was the first. More, an eighth generation descendant from He’s one of the oldest living beings among the Mythos. The father of all vampires (or Night-Children, as they’re called),... More, and therefore one of the weaker Night-Children. He makes a brief appearance in TEA, in which he requests – and is refused – the right to create another Night-Child.
Don’t feel bad for him. He wanted it that way.