|Location on World Map|
|Arceuus great library||←||Blood altar||→||Dense essence mine|
According to the transvergence theory and soul journey, the blood altar located in the Arceuus House is not the real blood altar; this altar was created by the power from the Dark Altar located near it, where it drew energy from the plane where the real blood altar is located.
It is used to craft blood runes from dark essence fragments, providing 23 Runecrafting experience. In order to craft blood runes, players need 77 Runecrafting and 100% favour with the Arceuus house in Great Kourend.
The maximum limit for crafting Blood runes in one visit is 212. This would be achieved by mining 27 dense essence blocks and then turned into dark essence blocks and crushed with a chisel into dark essence fragments. Then, another inventory of 26 dense essence blocks are mined and turned into dark essence fragments before going to the blood altar.
Note that you can only have a maximum of 108 dark essence fragments and therefore must be used before crushing the remaining dark essence blocks. One dark essence block is equivalent to four essence pieces.
The maximum possible experience is 4,876 obtained while doing the above.