So, Orpheus knew the Major Law of Perceived Reality, and he had always known it.
Gravis had believed that he had been one of the first people that had comprehended it very early on, but apparently, Orpheus had also been part of that club.
No wonder Orpheus had never shown his Avatar.
Additionally, Gravis' Will-Aura had never been powerful enough to see through it, and even more, Gravis had never questioned his own perception while looking at Orpheus.
Sure, the Law of Perceived Reality allowed one to see through realities, but the Will-Auras had to be on a similar level, at least.
How powerful had Gravis' Will-Aura when he had seen Orpheus the last time?
Level nine Star God.
Meanwhile, Orpheus' Will-Aura had already been at the level of a level eight Ancestral God.
The difference was too massive for Gravis to notice the difference between Orpheus' perceived reality and physical reality.