While there are some much more luxurious items on the list of drops for a Greater Demon, Vile Ashes is one that is unique to certain types of monsters within OSRS. Players will only be able to acquire these ashes by killing a Greater Demon, Lesser Demon, Hellhounds and Mutated Bloodvelds. This item is a practical one that allows the player to boost their prayer XP by 25 or you can boost this stat by 75XP if you offer this ash up for a demonic offering spell. It is also worth noting that these ashes are now available for Free to Play players which was not the case for some time.