Premium hero crystals
I play this game several years now, and still loving it. But when premium hero crystals stopped being a usable recourse for me, the amount off shards grew slowly up to 5 mil+. I think a update is long overdue.
Maybe we could buy higher rated shards with the premium shards? Maybe a fitting option depending on the progress off players? Or maybe a way to convert the shards in gold, wich is much needed by some players? Or other resources, like revives or health potions?
Keep on playing!