A new cultivation slot opened up, and Chen Fei placed the True Codex of the Mystic Matriarch into it without hesitation.
Choosing Dragon Elephant Heaven Suppressing would have been perfectly fine as well. Both would directly improve Chen Fei's combat strength, with little difference between them.
Without the Night Demon Clone, Chen Fei might have favored Dragon Elephant Heaven Suppressing, since it was an art from the Void Return Realm and would be easier for him to comprehend.
But with the Night Demon Clone, the stronger Chen Fei's origin became, the stronger the war soldier he condensed would be.
It was like the earlier distinction between training martial skills and cultivating internal power. His origin could strengthen every aspect of him, making it, in a sense, little different from raising his cultivation realm.
Ordinary cultivators who cultivated the Night Demon Clone to Chen Fei's level would not need to worry about whether they could condense a clone, but Chen Fei did.
The clone war soldier he wanted to condense was simply too powerful. If his origin could not sustain the expenditure, the resulting war soldier might fail to meet his requirements.
An ordinary eighth order mid stage or eighth order late stage war soldier certainly would not be useless to Chen Fei, but its help would indeed be limited.
The True Codex of the Mystic Matriarch was obscure and difficult to understand. Even with the correct answers before him, Chen Fei struggled to comprehend it.
It was already this difficult before reaching the proficient realm. The difficulty of cultivating it to the perfection realm, let alone the great perfection realm, was easy to imagine.
In the Life and Death Duel, Chen Fei had killed six eighth order cultivators: one at the mid stage and the rest at the late stage.