Master four classes. They don't tell you which four. So you have to guess, and hope. Later down the road Sony introduced Holocrons, which told you one of the classes you had to master. You could use three of them to figure out 3/4 of your classes (out of a possible 32). The fourth Holocron was "silent", so the only way to become glowy was to keep mastering classes until the old man showed up. So, no, it's NOT just "master a class and you get a glow bat, pwn brrt".