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 218.75 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.

Common collection methods
Players that have the ability to kill Abyssal Demons can "camp" in the Canifis slayer tower to kill them. This method for getting ashes is very similar to camping at green dragons because both are 100% drops. Using any beast of burden familiar gives you a great advantage because it allows you to carry more infernal ashes back to the bank. If you have 96 summoning, you can summon a pack yak and use winter storage scrolls to send ashes back to the bank. This method allows you to stay there for very long periods of time, making it the quickest method. Currently the prices for infernal ashes are not steady, ranging anywhere from 2-5k+, so this method can be used as a good money making method or as a good way to get prayer experience. Abyssal Demons also drop Abyssal whips, making Abyssal demons a far better option than camping any type of dragon currently(excluding frost dragons). This method has the ability to make between 800k - 1m per hour, not including Abyssal whip drops. The minimum is around 800k per hour which requires you to kill 3 abyssal demons every 1 minute (this is relatively easy for most 120+ players).

Another good way to collect infernal ashes is to kill black demons in the Taverley Dungeon. With this method you can either take high level defensive armour with good food and/or a bunyip, or you may take armour with high prayer bonus to protect from melee. It is recommened to have a house in Taverley, 70 agility (For the pipe shortcut), and a teleport to leave the area. Black demons also have decent drops, which makes this method very profitable for people who do not have 85 slayer for abyssal demons.

For those who have completed the Underground Pass quest there is a way of gaining these ashes from comparitively low level demons, specifically Doomion, Othanian, and Holthion, the level 91 demons that guarded Ibans' shadow during the quest. There are a couple of drawbacks to gaining ashes this way, the main one being that it can be a hassle to get there, as you need a bow, at least one arrow, a spade, a rope and a lot of energy just to get back to them. (or you could just enter the underground pass from the elf side, and travel back through the well of voyage, placing you "already there") This is not a good way to collect ashes if you want to sell them or use them at POH alters or the Ectofuntus. They don't have any other drops, and it appears that experience gained from actual combat is reduced. However all three are easily ranged or maged, and if you are more interested in gaining prayer experience through the use of urns or just by scattering the ashes you could gain quite a lot of experience in a short amount of time. For those who prefer to melee Kamen is still available for food as he was during the quest, if you're willing to pay or can stomach his brew.

one of the fastest ways to collect infernal ashes, yet an expensive way, is to use chinchompas or burst/barrage spells on nechryael in the Chaos Tunnels. This is a multi combat location, so many can be killed at one time. The occasional rune boot drop is also a decent bonus. This method of collecting ashes is risky, however, due to the use of protect from melee / deflect melee being required (or, alternatively, the use of soul split occasionally for those who can use it.) Also, the risk of PKers in the short journey through the wilderness to the tunnels is a potential hazard, but this can be avoided using the Dagon'Hai route.

Dropped by

 * Black demon
 * Pit black demon
 * Abyssal demon
 * Tormented demon
 * Nechryael
 * K'ril Tsutsaroth
 * Agrith Naar
 * Othanian
 * Holthion
 * Doomion
 * Chronozon
 * Ice demon
 * Balfrug Kreeyath
 * Tstanon Karlak
 * Zakl'n Gritch

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.