This game needs to fix a few things
1) Any arena team should only be allowed to use one of each character. No characters should be allowed to be used twice on the same team. Exception being generic characters that are common and uncommon like a swordsman, Archer and so forth any character that has like an actuall name should only be allowed to be used on that team once. Probally would be fun to do the same for Dungeons as well.
2) There needs to be a way to earn More Skill Books. Make a dungeon where you can win Skill books Rare, Epic, Legendary. These books are very important for characters and if you want to keep players around for the long term you gotta have a way for them to earn more books. Not saying make it easy but have it available for use FTP players.
3) Since I have been playing this game over the last year, I have made it past level 50 and I began noticing that each time I go up a level my enerygy only goes up 1 point. You gotta increase the energy a little more then that per level as the game goes on, I know Energy can build up and be stored pas the base line but if I am at the baseline and not winning anymore then it wont increase. I feel that being past level 50 I should be already past 200 Energey as my baseline.
4) Should remove the Daily quest of using 5 silver keys in Doom Tower. Doom tower is hard enough as it is and I'm sure there are a lot of other players who can't complete the daily advance quest either.
5) There is a serious silver shortage in this game It goes faster then you can earn it. A few thoughts I have are, be able to sell back shards in exchange for silver and also maybe even characters as well.
6) The training area should be allowed to be advanced further to higher levels to train champions a little faster or maybe add some more slots in there for more characters.
7) Dailey Log ins, Now that I have gone thru all the daily log ins I see it just repeats the last month all over again. Maybe you should set it up that after each 30 days you can earn an Epic or a legendary once again. You can do it as a shard so that it can go thru the void for a random Character.