Yataghan Decay Blade

A Little about the Blade
When Yaichi found the blade, it was in a decaying ruins. When he got to the rock where the blade was, there were about 5 scrolls. When he got the blade it had on the base of the blade Decay. At the moment, Yaichi no idea what this stuff was for. But when he read one of the scrolls, he found out how to use the blade. He found that the blade had spirits trapped in it, but Yaichi was 16 at the thime and thought it was a bunch of BS. He later found that what the scroll said was real.