The '''Heavy Furnace''' is an improved version of the [[Furnace]]. It can be [[Crafting|crafted]] after claiming [[Mastery Cave#Masteries|Mining Mastery]]. It takes 25 ores (or 5 quartz or fire quartz) and 3 [[Coal]] to run. | The '''Heavy Furnace''' is an improved version of the [[Furnace]]. It can be [[Crafting|crafted]] after claiming [[Mastery Cave#Masteries|Mining Mastery]]. It takes 25 ores (or 5 quartz or fire quartz) and 3 [[Coal]] to run. |