From the introduction: The Entropy Engine is a massive, mystic machine that draws on the power generated as order throughout the universe slides into chaos, then uses that power to reshape reality. It sits below the bulk of Dragon’s Delve, occupying an area carved out of the rock to accommodated it. Built by the Mages Four, the creation of the Entropy Engine was made possible by weak planar barriers in the rock surrounding the dungeon, due to the unique combination of the body of the dead god Iamon and the remains of a crashed dimension-traveling craft. Using the chaos energy leaking from the corpse of Iamon and the artifacts that survived the crash, the Mages Four constructed a machine that is, theoretically, capable of nearly anything.