This is a game with worst gacha rate ever. Dont waste ur money here. 1. there is battle power reccomendation on some dungeon, but even u already got enough battle power, the boss actually had a power that must be surpressed by one exact hero that you may not have, or else ur party will be dead. 2. The gacha rate, especially pet summon, its just wont give you legendary, except u have infinite rubies. 3. Arena, when u reach diamond rank, u'll see the very big gap of battle power.