Lin Yun originally thought that these people would become High Mages within three months. They already reached 9th Rank after two months, there would be no issue reaching High Mage realm within the last month.
But he could no longer wait.
To be more precise, it was because of the collaboration with the Black Tower. When the war was officially started, he wouldn't be able to avoid taking out a powerful force. Even if the Black Tower was the main force of that war, the five hundred Great Mages from the Merlin family legion felt like grains of sand, it made him a bit embarrassed.
It would be better presentable if fifty High Mages were added.
Moreover, they weren't ordinary High Mages...