Gazetteer - The Chaos Realm
At the far edges of the overlapping dimensions of the natural order there is a place. It does not support any life or order. It a place of constant cosmic static where the very atmosphere devours anything from the natural worlds; to walk there is to drown in pain without any afterlife. It is not a place with surfaces or laws. It is a sea of unending substance with no surface or bottom. To even look upon this distant place is to invite madness and corruption.
This far realm is the source of the Chaos substance which Ro-Rex used to create his godhood and where Garlic learned to shape the first incantations of arcane magic. The substance of the realm once pulled into outside worlds will breakdown and become a wild mutagenic that taints and corrupts existing mortals and immortals. It will absorb into a world as a pollutant and slowly infiltrate all orders of life and natural substance. Creatures touched by this taint will evolve into infernal demons or monsters that subconsciously pursue a destructive path. While some less mutated species and individuals can bring this under control and guide their own moral compass. The most common result is an evil mind with a twisted body. Even those just barely touched will be violent and accept brutality as a way of life.
But, if care is taken and willpower is applied to the substance with elaborate rituals it can be harnessed as a power source and fashioned into armor, weapons, or other implements. This hardened form of Chaos is called Cold Iron. The substance can also be shaped into dark solid balls that act as mobile power sources that make the most fantastic magic possible. Ro-Rex moved massive floating castles between worlds with these orbs. Once the will and rituals on these creations is removed the Cold Iron eventually breaks down and becomes a corruptive substance without shape or mindful purpose.