Incredibly predatory upgrad system In game progression is beyond slow and you're forced to either pay to progress or endure a long and grueling grindfest eoth your heroes either being far too weak or straight up under powered. There's an unnecessary amount of different currencies to worry about, gear rank up is unreliable and the rates are down right falsely advertized, you can burn through 100 of the necessary materials and still up at lvl 6 do you being dropped a lvl due to failing to succeed.