Summoning her Dao Shell was the final gambit that Ku Waowen could use. All of her techniques and skills had already been used, and none of them were effective against Lin Mu.
His strength was certainly superior to hers and their speeds were almost the same. But the more she fought, the more Lin Mu was gaining an advantage. The only thing she could not rely on was something that was far more powerful than everything that she had used until now.
And that thing was her Dao Shell. One must know that she was at the Shell expansion stage of the Dao Shell realm and thus the full power of her Dao Shell could be used.
This was significantly different from when Lin Mu had faced the Dao Shell of the Troll Demon beast. That was incomplete and this one was completed as well as expanded.