Could anyone who understands it explain the farming to me lol. From what I understand we have weekly dungeons that we can do 5 times a week where we can farm secret letters for some characters and then "daily" dungeons that we can farm infinitely for a different set of secret letters. All of the letters can be exchanged for either character shards or weapon shards, and then the demon wedges are farmed from a different dungeon. Is that right?