I like the idea! And I tribute Petra to be the one who falls unconscious!BTW, I already got an idea for a first arc. Basically, people around the guild and even in Fiore have been acting....weirdly old, even the young ones. They've been saying things like 'My back hurts' and 'I need a new set of teeth' When about 16 million people in Fiore were doing like this, a rift in the sky is suddenly discovered. Its cause is an Etherion which gets all of Fiore's Young spirit so he can be Immortal. Our heroes try to stop him, one of them falls unconscious temporarily until the Etherion is defeated. Im still trying to come up with a name and a type of magic.
Petra: WHAT THE!? Are you calling me weak!?
Also, instead of making the people of Fiore act like they're old, how about they do actually become old. And we can reference the Neo-Oracion Seis Arc (I forgot the name of the clock thing they used). Maybe the Etherion's curse is similar to that.