The Planes of Chaos

Discussing cosmogony with an being of chaos, much less a Chaos Lord, is likely to lead only to more confusion. Linear logic, causality, even truth, are concepts beings of Chaos find unnecessarily limiting. Turning to their sacred writ (such as there is) will be of little help, either. The Hymn to Perplexity is composed entirely of questions and no answers.

Still, when they choose to, the ancient monsters and angels of Chaos remember the Godhead, the One that encompassed all. It was no more Order than Disorder, no more Constant than Mutable. If there was a Fall, it was Chaos that was indistinguishable in any meaningful way from what came before; It is Law that is the aberration. And even that aberration was born of Chaos.

Limbo is akin to what the multiverse was before Mechanus, before time existed. It is primordial soup from which any concept or being might be instantiate.  Chaos did not remain untainted by Law, however. Form, causality and other concepts gave shape to the previously formless. The border regions coalesced into something different.

Arborea is the home of beings who revel in the the gratification of the senses. They seek to woo other souls to throw off the shackles of Law and experience the pleasures of greater freedom. They never coerce beings into accepting their gifts (such would be a violation of freedom), but mortal souls may not be prepared for the experiences they offer.

The sad, dangerous monsters of the Abyss cling only to the concept of Self. The entirety of cosmos is merely an insufferable dream they can never wake up from. They torment or toy with other beings, even other demons, in attempts to exorcise their irritation. They are seldom successful.