Jean-Armand St. Michel du Chantraine is the son of the Troll Bride and the Hexmaster. He's frequently called "Jay-Arm" and sometimes called "pretty evil boy."
Nephandus is a devisor and mage specializing in calling up demons and binding them to his inventions. He has a reputation (well deserved) of being able to create iron-clad contracts.
He's usually seen with a walking stick which is actually a set of controls for a number of attack and defense devises and spells. He's also followed around by a small golem that's animated by a bound demon.