Because her master is a supreme god of the Nishiang Phoenix Pavilion!
Tuoba Xiu had been given a supreme god ancestor the moment she entered the Nishiang Phoenix Pavilion... Precisely because of this, despite having just arrived, she was shown extraordinary favor. Otherwise, it would have been impossible for her to step into the realm of the Divine Emperor within a mere hundred years!
Now, Tuoba Xiu was already a lower divine emperor. She had also arrived at the Myriad Laws Academy and accumulated enough academic credits, qualifying her to enter the Trial Ground of the Gods.
Chapter 3879