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Although Ling Xiao was not a member of the Soul Clan, he was born with a powerful soul. Coupled with the influence of the Mountain and River Martial Soul, his soul power was not as monstrously strong as Ling Yixue's, but it was much stronger than most people, even stronger than the majority of the Soul Clan's members.
There must be a reason why the Heavenly Ninja Academy chose these two nearly transcendent martial arts.
The Snow Lotus True Scripture can only be cultivated after achieving perfection in the Snow Lotus Qi Technique, rendering it meaningless for most martial artists.
The Soul Burning Secret is only effective for those with a powerful soul and is of no use to the vast majority of martial artists.
By selecting these two martial arts, their goal was to thoroughly disgust the Hidden Dragon Camp in the event of a setback.
However, what they didn't expect was to actually help Ling Xiao and Ling Yixue instead.