When you get high tier level you wlil find out how much this game fked up man there morale intel need to upgrade hero but when you get new hero you can do x1 battle only and there 4 type morale intel also boss drop I played 48 battle to get 15 morale intel for tier 9 and my tire is 13 and i want to use my new hero but this system make new heros usless what point getting new ssr if you can't upgrade them when I was gathering them I was like plss come one this time just need 1 but system haha lol take other stuff really the one who give this type idea is pure evil