I definitely don't agree with the d&d sheet: first of all, he is a wimp, and doesn't have any physical power. As such, his physical stats should be between 8 and 12, as for any average human. Intelligence is the ability to solve problems and learn new things: since he still hasn't learned he can actually use the magic sword, I'd say low, but not really low, something like 7-8. Wisdom is common sense, survival instincts, the ability to understand what people want, or the unspoken subtext of a conversation: here he has the score of a potted plant, 3, 4 tops. Charisma is more tricky: it is the ability to influence other's opinions and intentions, presence and willpower. Bonus points for the smol critter energy, minus points for being a subservient moron: 12-14.
He definitely need a skill for the empowering ability and one for his luck in finding rare and powerful artifacts.