In an extremely vain hope that I might be able to get my Wild Artefact back, I tried Close Gate on Massif 110. That didn't work. At least something interesting happened. These sidequests have actually had some plot relevance. Yeul of that time apparently sacrificed the entire city in order to seal up a spacetime distortion or a monster or both. It's all getting jumbled around in my head, the different time periods and stuff. I can't recall if it was Massif 100 where, after completing one Fragment quest, Serah and Noel had a conversation about how this wasn't an ordinary Paradox and Yeul had sacrificed the city in order to contain it. But then later on, like right after I fixed the distortion I made in Massif 110, Noel mentioned Yeul sealed away a monster.
My brain is not wired for story right now.... I'm so numb and just out of it after all the monotony and hopeless wandering.