I forgot what's my current rank in DB, it's either Anbu or Jonin .. But i can say, playing DB is good since you can farm some Cave Keys in there, some nights i can get 6 to 8 keys while other nights, i can get some Rainbow Magatamas and Charm Materials .. Fragment Boxes are nice too specially the Red/Orange Fragment Box since you can get 1pc of Super Rare frag .. But playing DB needs Patience and little luck to get matched with fair-match opponents ..