In Kung Fu Panda 3, the villain who uses chi weapons is Kai. Kai is a supernatural warrior who returns from the spirit realm and seeks to steal the chi of kung-fu masters.
Kai was once a warrior and brother-in-arms to Master Oogway. Their relationship ended in conflict after Kai became obsessed with controlling chi, an energy associated with life and spiritual power in the film’s mythology.
After returning, Kai defeats masters across China and converts their chi into jade amulets called jombies. His attacks threaten both the mortal world and the spirit realm, forcing Po to develop as a teacher and discover more about his panda heritage.
Kai is separate from the earlier villains Tai Lung and Lord Shen. Tai Lung is the snow leopard antagonist of the first film, while Lord Shen is the peacock ruler opposing Po in Kung Fu Panda 2.