Ok, so I was thinking. Maybe in abyss and dungeons or in a separate event having cards that drop that permanently effect your hero's stats. You could apply them to any hero and a random stat would increase. Lv I 1-5%, lv 2 6-10% and lv 3 up to 15, maybe 20 % increases in a random stat. Kinda like res or xp cards. Would be a really fun thing!! Maybe even an event boss drop... 30, 60, 80, lv, I, II, n III?? Could be fun. Thanks!