Sllshya, the Great Ocean, reigns over Elemental Water as one of the four powerful leaders of the elements referenced in the Mythos of Achaea (the other three being Garash, Kkractle, and Whiirh). Though possessed of incomprehensibly foreign thought-patterns, this Elemental Lord was nonetheless forced into compliance with the Triumvirate's goals during the War of Humanity through the God Agatheis's newfound power of elemental control. Though unable to leave his elemental plane, Sllshya was able to increase Agatheis's elemental ability from afar, such that the God could summon vast armies of water elementals with which to carry out His bidding on Nishnatoba.
To this day, the whereabouts and intentions of Sllshya remain unfathomable and unknown to all. The Orb of Sllshya's Wrath artefact is named for this elemental leader.