The Eidolon Bismark, The Mariner

One of the three legendary beings, known as The Eidolons, creatures left behind after the Catastrophe by the Prime Dieties to safeguard the mortal realm.
A flying whale is the easiest description of it. it looks like a massive whale, six fins seeming to keep it aloft and mobile. Its upper half is covered in a rocky armor, from which mosses and grasses grow. At its front, the thick armor comes to an edge, akin to a rhino's horn or a icebreaker ship. Starting at its eyes, spreading across its lower body, and branching to the tip of each of its fins, mint blue energy is channeled in broad runes.
It has no set domicile, seeming to prefer sailing above, among, and beneath the waves, the most common of the Eidolons to see, the Bismark can cause rainfall with its passage.
Generally a peaceful creature, if disturbed it is capable of firing tremendously condensed balls of air or water, depending on its elevation. these dont seem to have a set source, capable of firing in every direction.

inspiration for image is a mix of Final Fantasy Bismarck, Pokemon Wailord and Primal Kyogre

follows a regular orbit around Alte'vurl, although it appears to change as the seasons pass (only appears to change because the planet tilts). complete trip takes a fortnight, similar to the moon taking a fortnight to go from new to full, or back again

A colony of Aeire Races lives on the landmass on the Bismark, a group of people aboard it decide on the name of the previous Age, based on events, star signs, etc.