After Jake bought a tower shield that granted him five points in willpower upon Mastery and an iron helmet that increased his mentality by the same amount, he got a new class. It was a bit of a pain to test so many combinations of items to get a class, but sometimes those surprises were quite addicting. The issue was that he couldn't quite tell what equipment he had tested or hadn't yet. That was probably a job that guilds were doing a better job categorizing those issues, but that wasn't the kind of information that they would easily share. Nevertheless, he will have to find a solution eventually.
Congratulations! You have become a Level one Guard!
Your health and strength will increase by four points, and your stamina, mana, endurance, and willpower will increase by two points whenever you level up your class.