raising Stars requires, max level, Materials and X fodder of the same star. the Exp and Material dungeons are limited to 3 times per day, running the highist Exp and mat dungeons does not always give the high mat or exp fodder, 3>4 takes 10 of the 3 mat and i maybe see 1~3 a run of the 5 dungeon. also every 2nd character inventory expansion costs preium currency because why not.