pentarch

例句：

1. 1.The pentarch was the leader of the group.
   五头怪是这个团体的领导者。
2. 2. The pentarch was responsible for the safety of the group.
   五头怪负责这个团体的安全。
3. 3.The pentarch was chosen by the group to lead them in battle.
   五头怪被这个团体选为带领他们战斗的人。