Trove Keys are needed to open different chest and boxes in game. Also in game has the rarest and most golden gem key that opens rare game boxes with a 100% chance. You can get it during tutorial or buy in Store. Shaper`s star key allows open chests in special world on arena, from which drops resource for boosting stellar gears. You can also buy from us keys which open class gem, Vault chest in delves and chest after kill Leviathan.