Divine Anathema - Six Dimensional Hell Steed - Ahuinan - Eldritch Stallion

In the world of "Divine Anathema" everything is split into the Materia and the Immateria - the physical world and the world of ideas. People with strong bonds to ideas, "Conduits" can summon "Bridges" from the Immateria to the Materia. These "Bridges" manifest physically as a transitory realm in between and they take the shape of the bearer's inner world. Once a connection to an idea fully realizes a Leviathan carrying the spirit of the belief enters into the material realm.
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Ahuinan is the "Leviathan" of a "Conduit". This "Conduit" was a chess grandmaster as a child. He later became a math professor specializing in game theory and economics. Eventually he was approached by the government. He rose up to became a military advisor at the ripe age of 48. With his very special view on outcomes, he also developed a strange relationship to free will. He believes his actions can impact things on a larger scale, but he is also absolutely aware whenever his actions do not matter and things are outside of his control.
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Ahuinan's body is build out of a baby that emanates chains of bodies that age with the length of the chain. All chains end in skeletons. They represent this conduit's view on differing outcomes and timelines. The only two certainties in life, birth and death.