Du You continued to move backward because the presence of sixth-tier beings became less frequent the further back he went. Although there were many sixth-tier beings in this world, it wasn't so easy to encounter many of them.
Furthermore, strong sixth-tier beings would generally not attack someone like him at the fifth tier. If they wanted to elevate themselves, they either had to kill other undead creatures of the same tier or rely on their own cultivation.
Without cultivation, as undead creatures existed for longer periods, their strength would slowly increase as well.
A few days later, Du You finally moved away from the battlefield, a sort of sneaking away that he hadn't done for a long time. Now doing it all over again really felt quite different.
This sense of crisis and pressure gave Du You that adventurous feeling he once had. There was a time when he too would constantly hide himself, not daring to cause any disturbance or stand out.
