Mysterious Blue Pan's Flute

Oh, what's this!? It's a Cursed Pan's Flute, but blue? This is the first time I've seen anything like this. I know Pan's Flutes summon Nightmares, but this blue color's throwing me for a loop... You should take this to the Archaeologist Jajan in Dratan, he studies esoteric secrets. As far as I know, he'll be the person to ask.