You really need to change something with the event quests after you unlock the mythic girl. Either her cooldown needs to be MUCH shorter, or you need to have a guaranteed pull of her from chests. I pulled 30 and didn't get her, so I have to pull 5 from her event monster over and over, 8 hours each time in order to level her up to lvl 5. It's just impossible to get the event toy if you aren't high enough level to get a bunch of colosseum items and don't have the ability to grind the game all day and lose sleep over it. This is very poor design and is not fun for the players.