Tom now knows that his own mother is a lamia witch .
Before she leaves , Mab tells Tom that to take revenge upon him , the Mouldheels will now join with the other two clans after all and bring the Fiend into the world .
Tom now knows that Tom 's own mother is a lamia witch .
Before she leaves , Mab tells Tom that to take revenge upon him , the Mouldheels will now join with the other two clans after all and bring the Fiend into the world .