The effect of the Rank Up Tower was indeed divine for creatures with poor cultivation skills and those who were lacking resources.
However, on Su Yu's Chaos Island, there were also many creatures with outstanding aptitudes. Their cultivation speed far exceeded the speed of the Rank Up Tower.
After all, it would take a full year of staying in the Rank Up Tower for a creature to advance from Bronze Rank to Silver Rank.
In the cultivation world, a year might only be a blink of an eye.
However, on Su Yu's Chaos Island, it was enough time for tremendous changes.
For example, many ferocious Generals who were recruited were born with an incomparable compatibility with the martial arts system. Their cultivation speed was very fast.
There was also Skeleton 1. After devouring a large amount of high-quality soul flames and purifying his body, he successfully broke through the limit of his aptitude and became a gold skeleton.
