It's inevitable, my liege.
Frankly, as soon as Weaver had said this, Skullius had already known what was going on. It simply agitated him. From then on, he had figured that his Primary Existence, his Default Hybrid Warmoth body, wouldn't be able to beat Fulgardt.
Indeed, it wasn't an Andori the Immoral was using to make himself invincible. It wasn't a Treasure either.
It was Fundamental Barter, but the kind that an expert of Skullius' calibre wasn't capable of using.
Skullius remembered when Suzamete had said that there were higher forms of Fundamental Barter earlier. Apparently, these were used to create the foundations of worlds, establishing more complex Rules and making it so that a world could adopt its own power system for the living creatures that lived there.