Your mentor wasn’t merely bad at his job – he turned out to be actively malevolent. That person could be an actual Nephandus, a demented Marauder, a ruthless wizard, a diehard “black hats and mirrorshades” type of Technocrat, an Infernalist sellsoul… maybe you don’t even know what your mentor really is, but it’s just plain bad. Obviously, this personage has fucked you up. Additionally, if you’ve uncovered things he would rath­ er keep secret, that could lead to other Flaws as well: Enemy, Cursed, and worse…