Ultimately, Sanev's arrogance stemmed from his belief that he was above others where it mattered. Ed doubted Sanev thought himself a great warrior for example. But he also likely felt that his superior intellect and magical prowess were far more valuable than physical strength.
So what kind of community service could Ed force upon him to remove this arrogance from him?
"You will venture out towards this point here" Ed said after drawing on the sand just outside of Sanev's house. Sanev could only look at the drawing in complete shock.
"That's a circle!" What Ed had drawn was not a point but an entire circle. That was to say Sanev's destination was somewhere within the circle he detailed. A circle which for reference was 5 times as big as the 'point' Ed drew for their current location which was a literal city.
"Don't fret the details too much, take this" Ed said before summoning some resources from his system space. Sanev twitched.