that's why it's a random, random fate, because it's not "expected" to be completed. If you're lucky, you will beat odin and get gold or silver and get drops. It's that simple. It's one of those things that give people a chance to stand out from just the standard leet grinders. If you really, really want to get odin drops, you can increase your chances and hunt him for a week or two, or however long it takes.