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This is my first Theory Post. I apologize if this has already been put forth before. I suspect the voidbinding the Fused use come not directly from Odium. Instead they are channeled via the 9 Unmade. In Rhythm of War the Sibling says they will be unmade if the corruption of the Tower is completed. This leads me to believe that perhaps The Sibling is not the sibling of the Stormfather, and the Nightwatcher, but instead more like one of their 10 children. One powerful Spren for each type of Surge. These are the true 9 siblings to The Sibling. These 9 powerful Spren of Honor and/or Cultivation were Unmade. 9 Unmade, and 9 voidindings. Not only would this explain why there are only 9 voidbindings, but also why the binding that is missing is the Bondsmith binding. None of the 3 known Bondsmith Spren have ever been corrupted into Unmade. If the Sibling, the Stormfather, or the Nightwatcher ever get corrupted into Unmade made it could allow for the 10th type of Binding. Taking this speculation further into territory that maybe should be a new post. If my theory is true this could also be the cause of the changing of the true tones of Roshar. My understanding of planet, star system, and magic system investiture is that the investiture is imbued by Shards into the planets. Which ties the Shards to the planets. On Roshar the Singers seem to be able to hear this investiture as rhythms. If Powerful Spren are tied to the investiture closely enough it would make sense that the corrupting of said Spren with the addition of Odium’s void investiture would change the investiture rhythms of the planet in much the same way that mixing of investiture Light changes the type of Light as discovered by Navani in RoW.