Time passed as Rui devoted himself exclusively to the development of Muspelheim and Niflheim.
Their importance could not be understated.
These domains were one of the few things that stood between him and death. Of course, he had many things going for him, but most were not truly effective against creatures of the magnitude of power that he was facing.
The predictive models he had developed on all species, the SOUL models he had developed on all species, and temperature domains to go for the most antithetical temperature he was able to. These were the cornerstones of any hopes for survival he had against the Master-level guardian of the Mellow Dungeon.
That was why he poured his heart and soul into the two new domains. Over the next year, as he proceeded to completion, Rui completely cut himself off from anything else. The only thing his mind thought about every waking moment was the two new domains that he was working on.