As A F2P player it seems that the rarer relics a completely beyond reach the expensive chest can give you a gold maybe a diamond. as F2P won't ever get the expensive chest or enough to get the needed relics. It would be nice to have a way to upgrade relics eg. a fully levelled up bronze relic can level up to a random silver relic. it could be better or worse for the player but it would be silver. and F2P players could eventually get a diamond. Maybe it would require more than 1 what ever to fit in with the game dynamics. could even be another temple/cave island the relic transmogrifier. would be good for p2w players as well to get rid of unneeded low level relics