I've read stories from the Imperial Library, but I don't know if they're true, about the ancient might of Ra Gada. They, apparently, destroyed an entire race with '5 Giant Swords' and literally deminished the entire race to a smaller size with magic. Apparently they are the only race with cannons and have heroes that have formed pure swords ("soul swords"?) from magic (or some other life force) and can slice atoms and do all sorts of crazy stuff.
Which of this is actually true in TES lore?
Thanks.