Oh, I didn't notice the pulsing. That's helpful. In any case, I found my missing piece after systematically going through all the towns in the past 'till I found one with a glowing orb. Even then, I couldn't find it until I cheated a bit by looking at a forum post. I hate these doors on the back of buildings you can't see until you rotate the camera around. I should've known, though, because you can see the back door from inside the shop where the fragment was.



