Qin Liuxi didn't necessarily need the Nascent Soul to lead the way to find Mu Xi and the others, but she was also visiting the Land of Nihility for the first time. She wasn't afraid to explore; if she were alone, she could play freely. However, she was accompanied by many good Daoist allies, and she couldn't just let them meet their demise here. Especially since it was rare to find allies with high Daoist cultivation and good character, she'd better recruit any help she could get, considering there was a big monster waiting behind.
Once she blended in with these Daoist allies, when it came to facing the big monster Si Luo, hey, a piercing arrow and a thousand soldiers meet, delightful!
