Traveling Through the Past, I Want to Make a Big Fuss in Honkai Impact III

What does it mean to have traveled through time and become a former civilization? Alicia: "My dear Xi Lian, why do you always stare at others? Do you think you are inferior to others? Hehe... He is pretty cute even though he is small)" Mei Yi: "Respond to me! Sister Xi Lian! Kiana: "Pink hair who is born evil... I understand Bishop Otto's mood..." Erode Xilian: "I will try my best to be her. Her thoughts are my thoughts, and her voice is my voice. We have the same face, the same personality, and the same memories. If Mei wishes, we can go back to the past memories~"