They can also be used when killing the demons mentioned above to fill an infernal urn. It takes 25 infernal ashes to fill an infernal urn, which grants 1,875 experience when teleported (equivalent to 75 experience per infernal ashes, which is an extra 20%). These ashes are usually a cheaper alternative to dragon bones, although prices often fluctuate, and players should look into the experience-cost ratio of each before any major training.