The League of Machines and Monsters

About seven years ago the campers first encountered a group called the League of Machines and Monsters when they tried to create their own master bolt. Since then they've continued to come back and attack us. The League is made up of children of Hephaestus who have turned away from their godly parent and hates all the gods. Their genius in technology helped them to create a way to let monsters by pass the camp borders by injecting them with the animus of a fallen demigod. The animus is what the camp borders look for when letting in a demigod so the monsters can just charge in whenever they want.