Get passive skill Elemental stone refine to 5
Change build to pur dex/luk
Get a mini furnace , put the stone ores eg: 10 red bloods in inventory.
Double click the mini furnace and it shows the stones you can make. Since you have 10 Red bloods in your etc - it will show Flame heart. double click it. Depending on your luck you will either lose the 10 ores and get nothing or get a Flame heart upon losing the 10 ores.
