Also: it seems like a really poor plan, in the long term, for the fate of the entire plane to rest on the sanity of one dude. If Hirou kept the sword, he could maybe try to work with the wizards—ask them to spend one day per week healing people, make sure the crops do okay, etc. Things maybe wouldn’t be perfect, but at least he wouldn’t be running the risk of everybody-dies.
Also: it seems like a really poor plan, in the long term, for the fate of the entire plane to rest on the sanity of one dude. If Hirou kept the sword, he could maybe try to work with the wizards—ask them to spend one day per week healing people, make sure the crops do okay, etc. Things maybe wouldn’t be perfect, but at least he wouldn’t be running the risk of everybody-dies.