Responses

I'm curious about this too.
I was thinking it was the same cave that the elderwood guardian came from but it had different monsters and nobody in that party was wearing any clothing with similar patterns.
Maybe it has something to do with the mysterious continent. Since they said that the cave was sealed off maybe the cloth is something from the royal family that was taken by one of those invisible birds. Like an attempt to gather information.
IDK all guesses on my part.
Alright, I need a refresher. What's up with the cave and the dead monsters and the blue cloth? Is that in reference to a particular arc? If so which one?