C414 Bidirectional Foil

"Lee Feng, those four 'notes' have all stopped at a few points of power in the star system. They can form a perfect tetrahedron in space that is one light year long and can surround the entire core of the galaxy..." Bu Zhoushan's voice sounded again, but this time he was a little hesitant, "My database does not have any information on this thing... Could it be the Earth Relic itself? "However