Soul Eater, Vol. 8

While Black*Star and Tsubaki keep Mifune and Mosquito distracted, Sid is
able to locate Arachnophobia's demon tool and put an abrupt end to
their sinister plans. But though the evil organization won't be
manipulating anyone's morality anytime soon, the blueprints for the
dangerous tool are sealed away in Shinigami-sama's secret vault rather
than destroyed. Surely Shinigami-sama would never think of constructing a
demon tool himself?!