For a cultivator, cultivating multiple powers at once signified a split of one's focus. One needed to absorb multiple different energies and comprehend the battle techniques of different elements. Much more time would be required in comparison to those cultivating only a single power.

On top of that, someone cultivating several powers would have a much harder time to release his full strength. For example, when Xiang Shaoyun battled using the power of gold, he could only use the power from his gold star while his other stars would remain dormant.

Of course, he could always activate his stars one after another, but he wouldn't be unleashing his full strength doing so. And if he only cultivated the power of gold, with all nine of his stars...