User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-27362456-20160814171415

I think I figured out how Shura became War Demon Shusui. I've been looking through different spheres at the Upgrade Facility and searched Dark Axe. It reads''' " However, if a normal human continues using it for a prolonged period of time, they will be haunted by a desire for war, slowly becoming demons themselves." '''