C477 Qing Ping Ah Nose Sword Cut Xuan Wu
The reason Black Tortoise roared like that was to attract all of the Giant Beast in the Abyss of Vicious Beasts over so they could bite Ao Mo.
Of course, most of the fierce beasts in the Abyss of Vicious Beasts were not even qualified to live in front of Ao Mo.
However, Taiyi Golden Immortal