Immortal Regiment

The Immortal Regiment or Undead Regiment is a  owned by Ōgai Mori.

Description
No specific information is known other than it is a classified data.

Yosano's ability was used by Mori in order for the skill doctrine to be proven its worth to the upper brass during the Great War. Moreover, three years after the war, Mori believes that an "Immortal Regiment" led by Yosano is capable of taking down the Port Mafia boss who is causing violence and havoc to the city, stating that she is a keystone in maintaining the Tripartite Framework.