In the Original Work, when Ye Xishui was blasted into the sky by Xu Tianran's Rank 9 Fixed Cannonball gift package and only escaped death through the power of Phoenix Nirvana, she had once said this.
Though she too possessed Twin Martial Souls, the mutual restraint between her Blood Soul Puppet Martial Soul and Light Phoenix Martial Soul meant she did not dare cultivate the Light Phoenix Martial Soul at all.
For that very reason, no matter how far she had progressed within the realm of a Limit Douluo, she would ultimately still have to fear Di Tian to some extent.
Without cultivating both Martial Souls, it would be difficult for her to condense a Yin-Yang Complementary Dual Soul Core with only her Blood Soul Puppet Martial Soul. She could only use the same Resonant Dual Soul Core as other Limit Douluo.
And that became the absolute shackle preventing her from ever challenging Di Tian in a human body.
For Ye Xishui, if she forcibly cultivated the Light Phoenix Martial Soul and the power of light and evil within her body collided, there would be only one outcome: like Douluo Continent's first Twin Martial Soul Master, she would become a giant bomb and be blown to pieces with a bang.
Though Chen Ping's Jade Scorpion Staff and Rampage Dragon Staff now housed the four attributes of lightning, fire, poison, and ice, with the power of ice and fire both being genuine ultimate attributes—
—that was only barely possible because Snow Empress and Scarlet King could each manage part of those attributes separately, while Chen Ping himself possessed a golden body, allowing water and fire to coexist.
If even the fusion of water and fire was so difficult, then trying to merge the light and evil dual-attribute Martial Souls within Ye