It was originally a monarchy, established by the god-king Kerberon. However, when The Mistress and The Soul Glutton trapped Alexander Harris and Dawn Summers in the dimension, this Kerberon was eliminated by Dawn.
The Key then became the goddess-queen and introduced the Anharrans Demons with architecture, theater and pacifism.
This world is similar to an prehistoric jungle with multiple swamps like Quor'toth. Like the Factory dimension, time moved also much faster than in Earth. Acid rain (known as the Devouring Rain) was a common occurance in this dimension. It was until Xander introduced the concept of slanted roofs that the Devouring Rain was a constant problem.