Warhammer Age of Sigmar

It is the Tidecasters who conjure the phantasmal sea that allows aelf and aquatic beast to move and breathe as if they were in their own natural environment. They are able to conjure spells from the repressed anguish of the Idoneth, the curse that echoes still from their ancestors’ torture within Slaanesh. Such magics take the form of crushing waves of despair, black pits of hopelessness or raging maelstroms of horror that shatter the minds of the foe, leaving them open to attacks from the Namarti and Akhelians. So potent are these enchantments that some victims believe themselves to be trapped underwater, causing them to drown in their own fear and sorrow.

He was the first of his kind, and is the last of the Cythai still alive. All Ionrach bow before him, their one acknowledged leader, the eldest and greatest of their race. He is Volturnos, High King of the Deep, and he holds undisputed authority at the Idoneth’s assembrals. He rides to battle atop his Deepmare Uasall, and sends a surge of pride coursing through all who fight beneath him. A leader of legendary status, it is said that none can read the flow of battle better than Volturnos. He carries a sword known as the Astra Solus, which cuts through armour with ease, leaving a blazing trail of luminescence; and a shield which can swallow hostile magic, rendering it null – Volturnus is not content to lead his troops from afar.