To become a Level 4 White Wizard requires a Destiny Solid Stone, a fact that Milton Cheney only learned during this true body simulation.
Upon his return to the Guardian Sea, he nearly made a forceful breakthrough to the fourth level of wizardhood.
Before this, neither his books nor his mentor told him about the Destiny Solid Stone.
This object is indeed precious, after all, it is a treasure assisting a Level 3 White Wizard to become a Level 4 White Wizard.
However, to say it is extremely rare or nonexistent in the Wizard Realm is not exactly accurate.
After all, there are many Level 4 White Wizards in the Guardian Sea, most of whom became so by using the Destiny Solid Stone.
Since they could get it, Milton Cheney figured he would have no huge issues getting it either.
In this true body simulation, he didn't get the Destiny Solid Stone, but he learned countless pieces of information about it.
This kind of information won't be worth mentioning in five hundred years.