The general answer to his questions was fairly simple: The demons had told them. They seemed to be quite enthusiastic about sharing their plot, often gloating about how well it was going. Which wasn't undeserved; it had been a losing battle, and the mortal races had only slowed the demon's advance, until recently. The method of penetrating their defenses had been discovered by accident; some had discovered it before, but no one had been able to piece it together until recently, which is when the summonings began, in the last couple of months.