Travel Through the Wilderness to Save the Human Race

Xuantian accidentally traveled to the ancient world and found that in this dangerous world, there are crises at any time and risks everywhere. The human race is faced with many crises, difficult situations, and separations of life and death can be seen everywhere. If the human race is not doing well, how can he, Xuantian, be doing well? What he needs to do to fight against the demon clan, save the human race, and realize his own path to immortality depends on Xuantian's fate. . .