I´ve thinking, considering how much of an hazzle is farming radiant fire cristals, what if all the fire EXP that goes to your ready to level up equipment, (i meant the loss excess) goes to a condenser in the right next to the items, and once fully, it gathers 1 star, and you can harvest them in your inventory from a safe place. Like, if you fill the bar 5 times and stack them (Considering making it go up to 5 stars would take more effort) it could give 3 fire cristals of the tier you let it full.

I mean, sound slow and grindfull. But its way less hard than having your 5 star equipment stuck at level 5 for almost six years. *shrougs*