Quest Crystals
I think Quest Crystals either need upgraded or discarded altogether. The rewards you get from opening them are pretty lame. The ISO doesn’t really help the upper tier Champions(4* and up), especially when they’re ranked. And the paltry good you get from them is laughable. Sure, when your account is new and you’re just starting out with 1* and 2* Champions, they’re useful, but after that? Not so much