Not to be confused with the episodes "The Mudstone Abyss" parts 1, 2, and 3. The Mudstone Abyss is a monument currently under construction in Desert Bluffs 2. Envisioned by Kevin as "a one-mile wide, four-mile deep inverted cone chiseled with sacred symbols and texts, dedicated to the Smiling God", it will take a year to build with every citizen being required to help. It is meant to be the Desert Bluffs counterpart of the Brown Stone Spire.
During the construction of the monument, people involved suddenly lost the ability to communicate and started talking gibberish. According to Charles, this was caused by unpure souls being disturbed.