Are there any extra books besides the three main books that I should read? I just completed Oathbringer and wanted to look up something I didn't get about Odium on Coppermind. When I opened the page related to Odium there was SO MUCH information about him I didn't read in the books and don't even understand. There were something called Shards and all which (correct me if I'm wrong) I think haven't even been mentioned in the books. Where did all this info come from?