I don't know if it's because the character of blue alum is so good that it got the legend of "turning over the sky" seal in a small family. It's said that it was the magic weapon of the emperor in the early days, with infinite power. But now it looks like a common seal. Although there is a strange fluctuation, blue alum doesn't think it's comparable to the eastern bell Treasure.

blue alum took the seal in his hand and asked the spirit of the sword, "you can't read it wrong, can you? It's a turn over seal? I don't think so. " He put a little immortal power...