The Deepkin Enclaves are the hidden underwater civilisations of the aelves who dwell in the ocean depths of the Mortal Realms, secretive societies born from the souls Teclis rescued but could not fully cleanse of Slaanesh's corruption. To sustain themselves, these aelves must periodically harvest the souls of other beings, and so their enclaves exist in shadow, striking from the deep before vanishing without trace.
Each enclave, such as Ionrach, Mor'phann or the warlike Fuethan, cultivates its own character and traditions, from diplomacy and healing to raw aggression. Their raids are cloaked by the Ethersea, a magical veil of enchanted water that lets them attack coastal and even inland settlements as though the ocean itself had risen up around their foes.
Riven by guilt over their predatory nature, the Deepkin Enclaves keep their existence secret even from most allies, and their warriors are known to the wider realms as the Idoneth Deepkin.