Thanks to this unusually generous [ page of exposition] [[Chronology - Volume #|✣ ]], we know that The Platonic Solid is the name of the mace Andronicus Valois wields as The Storm King. Its origin is muddled: according to Violetta, the King received it from Queen Albia of England, but later on the Master of Paris says he was present for its construction by his mentor Van Rijn. Whether this all fits together or is an oversight on the Foglios' part remains to be seen.