Fuel

Description
 is a generic term to designate a reagent used in a crafting station to produce new products from ingredients.

Source
Fuel can either be mined, harvested or found laying on the ground.

Use

 * The burning ones like, , , , , and  are used in various crafting stations.
 * is also used in any tannery to produce from  and in the  to produce, , etc.
 * Some cooked food is used in any wheel of pain to break knocked out foes into thralls.