Hill had certainly not gone into seclusion.
But he really did need some time.
After all, adjusting and altering spells from the First through Third Circle posed almost no difficulty for him, even offensive spells.
Even with the kind that created massive fires, Hill merely had to use an incantation, was basically unable to cast them instantly, and had to invest a bit more mana. It was not that he truly could not use them.
It could only be said that he was not much different from ordinary Mages in that regard. They simply were not as effortless for him as his innate spells.
Hill had no problem using spells above the Fourth Circle himself, but changing them according to this world's laws was somewhat troublesome when it came to spells involving laws of destruction.
The main reason was that once this world's spell energy reached the intermediate level, it carried a hint of darkness... This was not merely because most of the world's laws were controlled by the Lord of Hell, but also because of the despair inherent in this world itself.
Hill was not particularly willing to let himself feel this world too deeply.
This world was indeed tragic, and its people's experiences deserved sympathy. But once he empathized too deeply, he might end up losing himself in it.
Hill was someone who wholeheartedly wanted to return home. He had no desire to let unexpected events hold back his steps, even if those events could bring him tangible benefits.
Hill had thought about many things during this period of isolation... He seemed to be quite welcome in all the major worlds.
Including Toril.
Those endless Divine Artifacts certainly had not been tossed into his bag by Ao. They could only mean that Toril's World Will had been inclined