A huge area of what appears to be giant neutralized whiterock structures stacked on top of eachother in concentric circles. The radius of the affected area is several miles long, and the structures inside constantly crumble and rebuild in new formations.

Something from the Skyshell had burrowed its way into the ground after falling, somehow not dead even after centuries of sitting in the barrier. It tunnels and reconstructs material constantly, true form rapidly moving within the walls as it slowly terraforms the area with stacks of strange, cylindrical rooms. The walls are filled with strange liquid if broken.

Named JARS for its appearance of being lots of clay jars stacked on top of eachother. Several small towns live inside the everchanging walls, the outside contained by an unknown limit on the organism's range. Theories compare it to the natural circles fairy rings tend to form, or some sort of purposefully encoded limit left by whatever species had created it (as its resemblance to a city has led to assumptions that it must be some sort of terraforming organism).

Contamination of the bloodstream with the fluid located in the walls will cause JARS sickness, which causes the infected individual to develop wanderlust, restlessness, and extreme cravings for minerals and unusual items similarly to Pica.