User blog comment:Zack Tan/Volume 7 Intermission/@comment-26135947-20150903151531/@comment-138.162.0.43-20150903162126

Well if we're all just speculating... they could be remnants of the previous Yggdrasil visitors. We still don't know anything about the invasions from 400 years ago, 300 years ago, and 100 years ago.