The Hoyacin are large, floating chunks of Taeavor, locked within the The Sheltered Plane. When Tauwollid crusaded against all life in the metaverse born of Shumi, their crusade ended at Taeavor, called Eterna by it's inhabitants. Tauwollid created Agavina, and threw the mass into the world, shattering it. The Hoyacin are liquid metal rock chunks, core fragments, and pieces of the original planet's crust that have collected centuries of dust to create
For a closer look at the Hoyacin, check the A fractured world