The Truthspeaker, and Fundamental Manipulation
ON THE TRUTHSPEAKER PLANS
Nucharon's study of the Fundamental Plane was focused around the concept of altering the truth. Proper manipulation of the Fundamental Plane involved stating a lie as true, and forcing it onto the world. Nucharon's Truthspeaker effectively served as a semi-autonomous instrument for this. However, the Truthspeaker was not meant to be the instrument for the entire cosmos- a common misunderstanding.
The Truthspeaker, as per its name, "spoke" truths about the world, and made it so. The plan was for it to wipe the face of Urias bare, turning it into a perfect sphere orbiting in a perfect circle around the Sun. The Truthspeaker would then Speak onto the simple stone sphere, allowing it to manipulate the entire planet and turn it into essentially a more powerful Truthspeaker. From there, the Sun could be rewritten, and so on until eventually all the cosmos could be reshaped in perfect, simple order as per Nucharon's dream.
The Truthspeaker could not simply rewrite everything from the laboratory. A Fundamental manipulator is limited by its size and its target's complexity. The Truthspeaker could only rewrite a few mountains at first before needing to move to another location, but as Urias was remade, its range would grow to countries and continents and eventually the planet as everything simplified. With a planet-sized Truthspeaker, over a few years the Sun could be rewritten.
Each planned incarnation of the Truthspeaker was intended to carry along a computed essence of Nucharon. Nucharon personally recreated himself in the first one, as an independent control personality that could be given a physical form by Fundamental manipulation. The plan was to copy the personality again to the planet when it was rewritable, and the first Truthspeaker destroyed. Each Truthspeaker would carry Nucharon's mind, and he would plan each step up in scale.
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ON FUNDAMENTAL MANIPULATION
It should be noted that "speaking" is generally loosely used. While Nucharon personally could rewrite the nearby world by stating how he wished it to be, actually talking is an inefficient method of Fundamental manipulation. Nucharon and Sophine could simply will things into form, while the Truthspeaker's lack of an independent mind meant that it relied on a planar wave system that clearly travelled to the target. This system was powerful on large scales, but weaker on smaller ones and could be countered by the (on average) much weaker Sophine.
In addition, the method of Fundamental manipulation affects the power of the results. Nucharon, as an experienced user, learned how to precisely alter truths directly. Sophine, before her voyage through the Fundamental Plane and bodily reconstruction, did not know these techniques and instead used the weaker method of property manipulation. If Nucharon wanted to stop a train, he could simply will that the unmoving train was reality, whereas Sophine would will that the train stop. Sophine did eventually learn Nucharon's methods, but it took years of work afterwards and a significant raw strength boost from her body being reconstructed from the Fundamental Plane up.
