|Release date||7 January 2016 (Update)|
|Location||Dense runestone mine|
| Oversees the acquisition of essence for the Arceuus house.|
Clerris is an NPC located near the Dense runestone mine.
When players have achieved at least 25% favour in the Arceuus house, they can mine dense rune essense blocks. Players can hand these blocks to Clerris, rewarding 0.1% favour for every four blocks handed in.
Once players have achieved 100% favour in the Arceuus house, Clerris will tell them that she does not require any further dark essence at present.
She is also the anagram solution to "R slicer", with the challenge scroll answer of 738.