Sudden Intrusion

The moment Ren started to counterattack the Ancestor of the Mo Clan felt pressured. Ren's body was as hard as a treasured blade, and each of his attacks was powerful. Still, that didn't stop the Ancestor of the Mo Clan's flow as his technique continued to strengthen itself. 

The technique the Ancestor of the Mo Clan was using the [Mad Sabre Consecutive slashes] was something he found when he was younger. Back then he stumbled upon an inheritance site where he was found the [Mad Sabre Consecutive slashes]. After learning the basics of the technique his cultivation progressed by leaps and bounds.