The journal was virtually the last hope for Archmages who couldn't break into the Heaven Rank. Not all the people could resist such temptation. At least 50 percent of the hopeless level-9 Archmages would try to study the journal, and 30 percent of people would do experiments…
The Heaven Rank mages were the minority in Noscent. There were 100 times more level-9 Archmages who were unable to break into the Heaven Rank.
There were also the mages who had run out of their potential after breaking into the Heaven Rank, and couldn't make any progress for hundreds of years. It was a good opportunity for them too.
The Plane of the Undead was already connected to the Leviathan Plane. Transforming into a lich at this moment meant that it would be easy to enter the Plane of the Undead. They could even help undead creatures attack the Leviathan Plane, and then claim a turf in the Leviathan Plane as a lich with a dominion.
