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No matter what level the Magic Cultivation Manual or Combat Energy Secret Manual is, there is a common rule when it comes to cultivation:
It's easy at the beginning but becomes harder as one progresses.
The higher the grade, the greater the difficulty.
Star Flame Fighting Energy, the type of combat energy that Yekaterina cultivated, is considered one of the highest-ranked fighting energies on the Sky Dome Continent. There are very few that surpass Star Flame, and its difficulty is, thus, self-evident.
First, talent has already prevented most people from even considering cultivating Star Flame, as this type of fighting energy requires an extremely high aptitude.
In that respect, Qin Chu had no problem; his talent became even more exaggerated after his rebirth.
