Volition was formerly the fifth moon of Quire, and is now at the center of the Quire System. It has an unstable, shifting surface of "crackling black glass and bubbling oil shores" that changes appearance, composition and state of matter constantly, but is something like "possibility turned into a sphere floating around a beautiful planet".[1]
Volition was built by the Iconoclasts, followers of Independence who were changed dramatically by Quire at the end of the war against Independence. The Iconoclasts created Volition as their god -- a factory of pure will. Its role would be to create post-Divines that do not need people in order to exist (Axioms). Volition is itself a kind of Divine or post-Divine.[2]
Volition was activated just prior to the Miracle of the Mirage, continually creating Axioms by forming them from its surface.
This section contains spoilers for Twilight Mirage 66: Futura Free Pt. 3.
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In the finale of Twilight Mirage, Volition took on their "child" Polyphony as an Excerpt, after hearing their argument that they could work to make a world in which everything and everyone is able to realize its ideal form. It then allowed itself to exist in relation to people, with a sun at its heart. While it continues to create Axioms occasionally, it has calmed considerably.