I'm a newcomer. The only "fluff' source I own is Battletome: Seraphon and even that's not all fluff. I'm afraid it might be too late to learn the lore of the Lizardmen, but I'm intensely interested in the lore of the Seraphon. I didn't come to the game, the models, or the stories, however, until at least a year or two after the Age of Sigmar game was launched. If I want to know all there is to know about the current continuity, what do I need to purchase and read?