Dense essence block

A Dense essence block is a raw material used in the Runecrafting skill to make blood runes and soul runes. A dense essence block can be used on the dark altar found north-west of the dense runestone mines to infest them with dark power, turning them into dark essence blocks. These dark essence blocks can be crushed with a chisel to turn into dark essence fragments. These dark essence fragments can then be used for runecrafting blood and soul runes.

Obtaining dense essence blocks
The only way of obtaining dense essence blocks is to mine them at the Dense runestone mine, located in northern Arceuus.

A Mining and Crafting level of at least 38 is required to mine dense essence blocks, granting 8 crafting and 12 mining experience per block mined.