They really need to make EXP material dungeons unlimited. As it is, it takes way too long to level your characters (and the amount of EXP they need is insane), and actually makes pulling for event-helpful characters depressing. For instance, I pulled for Werewolf since she helps a lot with this Ranga and managed to get her, but after dumping all of my EXP into her she's still only around Level 45 and at 5*. I have all of the materials to evolve her to 6*, but no means to actually increase her level since EXP material dungeons are limited to three per day. Meanwhile I'm sitting on a crazy amount of stamina (a little over 53k) since there's no use for it outside of the limited daily dungeons runs and story mode, of which the latter takes WAY too long to level your characters, and I'm not about to let my phone run all night grinding it all.