Sorry, I made the assumption that most of our characters are in a relatively similar area, with a "base camp" so to speak. To that end, I was thinking about making a post where Nianxi ventures out and finds Susanna, Seth and Manthan, after some brief dialogue some imps attack and overwhelm them, and then Nianxi more or less accidentally learns her first sword skill (and passes out briefly after that).
Our characters get to meet, and those two could witness the potential of those relic weapons, and may even chose to search for the remaining 5! Also, Seth could make some remark about the sword "So these are their weapons..." (Because that first skill would do something that swords normally don't do.)