Wolves of Yoshida

The Reinoheishi (霊の兵士, literally "Warriors of the Soul") was a group of surviving souls that were gathered together by Seireitou Kawahiru and Raian Getsueikirite. The group was founded during the youths of the aforementioned individuals, following the death of their teacher, Shōyō, in order to survive in the war torn Soul Society by working as a cohesive unit. It was disbanded after the two of them had been instated as Captains of the premature Gotei 13.

Overview
Known as the "Wolves of Yoshida" (吉田の狼, Yoshida no Ōkami), due to their founders' originating from Yoshida and because of their savage methods of combat, they were a group that, at the height of their existence, rivaled even that of the premature Gotei 13 and was stated to have possessed over fifty members.