The Devil is the main antagonist of the entire Chick Tracts series.
According to Jack Chick, the Devil is an evil spirit that will stop at nothing to get your soul at all costs. Whether it be through books such as Harry Potter, or playing role-playing games such as Dungeons & Dragons. He will try to get you anyway he can. Oh, and if you celebrate Halloween, then you're celebrating the Devil's birthday, and you may go to Hell for it.
So now that you know, repent at all costs.