Devil War

The Devil War is an 'event' that is open only on Wednesdays and Saturdays (server dates). I won't try to simply repost the large amount of information that the game already supplies here. Instead, clarifications will be better.
 * The Magic Bell drop rate from story dungeons is, indeed, very low. If you're frustrated, just know you're not alone in wishing you had more. Elex is already receiving feedback about it.
 * Magic bells aren't turning up anywhere else. Don't hope for them to appear in the Jade shop, as an Enounter reward, or a chest.
 * The copper and souls rewarded for a win may be based on your level. It seems there will always be another of the rewards tacked on. They won't be large - usually 2.
 * The main benefit of the Devil's War isn't for copper, souls, or any of the other battle rewards. It is providing a free way to for everyone to eventually obtain Demon Lu Bu (and some free Evolution Keepsakes along the way). Enjoy it.