The chaos before everything, apparently, walled out by the Weave. Was leaking through the tears in reality/Doors, could have been part of what was messing magic/reality up as well.

Desmun discovered that the natural state of reality is pure chaos, where every possibility and impossibility exist and annihilate one another. He termed this chaotic state as the Strong Extratemporal Force, or “impossible.”

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Many gods were created and destroyed in that cacophony before Rhythm (Time), Craft (Technique), Prelude (Life), and Postlude (Death) survived. Rhythm built a wall to protect the place we live from Paradox. The Weave, the stuff, I’m sure it’s been called many things.
- Salinger

Related

  • Its firstborn is a great serpent imprisoned in a sea without sky or shore (perhaps glimpsed when Esmund sent the Deeplurker through to its home plane)
    • The serpent has a Harbinger agent, a being of shadow that Sylas was hunting