After Li Xuan had seized Shulv Ping's left hand and his golden stamp, all of the Undead Cavalry retreated promptly and orderly towards the north.
Having lost the commands of Shulv Ping, this Undead Cavalry army would retreat back into the Mausoleum of the Tai Grand Emperor of Liao and fall into slumber once again.
Li Xuan had no control over them. Though he could use the Grand Air Thunder Sound to command every spirit, this required a great amount of Zhenyuan and Hao Qi.
However, after dealing with Sikong Xin, the God Lord of Ten Thousand Coffins, Li Xuan didn't have much Zhenyuan left. It was impossible for him to eradicate all these undead cavalry completely.
Moreover, this was the Mausoleum of the Tai Grand Emperor of Liao. If these Undead Cavalry were not really devastated, they would sooner or later resurrect from the underworld within the Mausoleum of the Tai Grand Emperor of Liao.