1. faith reroll system, this is the biggest issue that's need to be resolved ASAP
2. stamina regen system and stamina cost over gems , make the stam regen 7 min or lower, and change the cost of refill stamina using gems, maybe 5 gems for 15 stam or 10 gems for 20 stam, becoz for now the conversion rate is pretty horrible
3. make the player can use their friends hero from the start so we don't need to sacrifice one RANDOM hero in a difficult battle, for example , this event legendary battle