|Release date||14 September 2011 (Update)|
|Quest item?||Ritual of the Mahjarrat|
|High Alch||0 coins|
|Low Alch||0 coins|
|Destroy||You'll be able to get a new one among the rubble on Kethsi.|
|Store price||Not sold|
|Examine||A small stone carving.|
The tetrahedron should be taken to the underground area, along with the other three tetrahedrons, and placed in an indentation in the wall. This will give a letter which, when combined with the letters with the other tetrahedrons, will form a code that corresponds to a location. The code's location can then be found using the strange device.