The Archetoi are apart from yet also vital to sea-kinden society. They are sometimes identified as builder-kinden, although we haven't seen enough of them to identify whether there are multiple different kinden, like the Great Families, or just a single kinden. They have chosen to draw power from the spirit of corals.
Archetoi are masters of the art of Acreating. Every colony that exists in the deeps has been built by members of this kinden. Although they live in the colonies that they create, most people rarely see them, and they live between the walls. The have the ability to move through the walls of a colony. Whether this is only one which they have accreated or any solid substance is also unkown.
Builder-kinden tend to be slight and smaller than average