Blood Arrows of Yajinden were created by Asahina Yajinden during the first uprising of Iuchiban's hordes to be used by their skeletal archers, increasing their Kyujutsu ability. Later the bloodspeakers made more on their own, which were mixed with normal arrows to gain new recruits. The archer who used a Blood Arrow had a chance of became tainted. The First Oni's blood had been used to create the arrows.