As it stands, calx is needed in immense quantities for efficient smelting. The only real alternative is gathering loads of bor by hand or, in certain cases, buying from a vendor. In order to reduce dependence on calx and vendors, we should be able to create charcoal from wood which functions similarly to coal. This also would have the effect of allowing high yield smelting in towns like moh ki and vadda that have less access to calx. I understand that allowing easy coke could lead to various economic concerns so charcoal should probably be unable to make coke.