The Weaver King is a group of weavers who are tangled up together and have fused into a single consciousness. They possess the ability to heal other weavers and mothkin, but are dependent on others to provide them with water for sustenance. Some see them as akin to a god. It is unclear whether the weaver king in Old Man's Chin is the only one that exists or if there are others.
The weaver king is based on rat kings.