Xiang Mo Chu (降魔杵)

Drawing of a Xiang Mo Chu (right), from 'Jin Tang Jie Zhu Shi Er Chou (《金湯借箸十二籌》) '.

Xiang Mo Chu (降魔杵, lit. 'Demon-subduing pestle', or Vajra) was a simple yet effective siege defence weapon designed to counter siege tower. It was simply a long battering ram mounted on top of fortress wall, designed to be used in conjunction with pole hooks to immobilise enemy siege tower so that it could be destroyed more easily.