He used three high-rank Erosion Crystals but only leveled up twice.
Moreover, he didn't acquire any new breakthrough skills, which left Xu Shu quite dissatisfied.
"I wonder what the conditions for skill breakthroughs are. Is it still one every five levels? It seems like the crystals needed for leveling up are increasing."
Xu Shu stroked his chin.
He definitely felt that the higher the level, the more "experience" it indeed required.
However, in this world, lots of things are lacking, but there's certainly no shortage of monsters.
Want Erosion Crystals? Isn't that simple?
Wasteland often had First Rank monsters wandering in, endlessly. Just kill them, and one might even find many buried beneath by just digging down.
If one is brave enough to venture beyond the borders, it's like a sea of monsters—like the never-ending beef in a bowl of beef noodles.
You can't kill them all, literally never-ending!