Maybe the place that's trying to be broken into contains one of the Dragon Slayer Lacrima? It could be either be one of the artifacts to break the seal or maybe dragon slayer magic is one of the things needed to break the seal? As for an antagonist either one of the cult leaders or maybe a guild related to them who have the same objective? Like the Shadow Crows being part of an aliance or under the control of a similar dark guild. Kind of like Oración Seis bit where there were a bunch of dark guilds working for them?<br/><br/>For something a bit off topic, I like your new avatar Annie. Konosuba was my favorite anime last season although my personal favorite character was Megumin.<br/><br/>