Infernal ashes

Infernal ashes are a 100% drop from black demons, abyssal demons, tormented demons, nechryaels, and most demon bosses. They can be scattered for 62.5 prayer experience, taken to the Ectofuntus for 250 prayer experience or used at a POH gilded altar with both incense burners lit for 218.5 prayer experience. Note that if you use ashes on the Ectofuntus, you do not need to use them on the bone grinder to produce Bonemeal.

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. A full Infernal Urn grants 1875 experience when teleported (equivalent to 75 experience per infernal ashes, which is an extra 20%).

When using infernal ashes on a POH gilded altar, it costs coins/XP, which currently makes it a much cheaper alternative to Dragon bones. Note that, since this is a new item, the price may change drastically over the next several days, and the actual price may end up being significantly different from the current Grand Exchange price.

Dropped by

 * Black demon
 * Abyssal demon
 * Tormented demon
 * Nechryael
 * K'ril Tsutsaroth

Trivia

 * In the knowledge base, it is stated as being a Free-to-play item, despite none of the monsters that drop infernal ashes being found in the free-to-play game.
 * When infernal and other ashes are offered to a POH altar, they still appear as bones being offered.
 * On the first day of release the Grand Exchange price for Infernal Ashes was 1700 gold. However the actual ashes were selling for over 5000 gold which is more inline with the prices of bones that give similar prayer experience.