Destructive Soultrait
All Michael had to do was advance to the 12th Star in the freshmen ranking.
Unfortunately, he had to meet a few requirements before he could challenge one of the 12 Stars, otherwise, everyone in the Saphirelake Military Academy could challenge the 12 Stars all the time.
The requirements were a restriction to ensure that the 12 Stars wouldn't have to be in the Colosseum all day to accept other students' challenges.
First of all, Michael had to enter the top 100 in the rankings. Once that was done Michael had to win five challenges in succession before he could challenge one of the 12 Stars.
He had yet to start his thorough research of the 12 Stars and would do so while waiting for the students he challenged to arrive.
Most students were in the Origin Expanse most of the time. It could take a while before the system found someone who was free and who he could challenge in the top 500 rankings. With that in mind, Michael researched the other Stars.