The Dark Altar is a unique altar located in the Arceuus House, which allows dense essence blocks to become infested and turn into dark essence blocks, which requires 100% favour with the Arceuus House. These dark essence blocks can then be used with a chisel and crushed into dark essence fragments. Each dark essence block is equivalent to 4 pieces of essence.
Dark essence fragments are required to craft blood runes and soul runes.
Using dark essence blocks on the altar reduce prayer points by 1 per block and 2.5 Runecrafting experience is gained per block.
The Dark Altar’s origins and age are unknown, yet it has been studied by the inhabitants of the Arceuus House for as long as their documented history. The Dark Altar’s power is near-limitless, and the full extent of its power remains largely unknown, even by those who have studied it extensively.
According to Amon Ducot, the author of the transvergence theory, it has the ability to bring life out of death when reanimating corpses, corrupt individuals and break minds. In addition, its power allows it to bridge the gap between life and death, sanity and insanity, as well as converging the dimensions needed to craft runes.
It is known that its power created the blood and soul altar located near it by drawing energy from the planes where the real altars are located1. This power enables the souls of Great Kourend’s dead to be transported to the River of Souls, where they are brought to the afterlife2.
Although not visible in-game, it is known that texts of an ancient language are inscribed on the Dark Altar, which contains a recurring symbol that translates to sacrifice3, although it may also be interpreted as death4.
A pre-release model of the Dark Altar
, Artwork depicting the Dark Altar