Blood Fiend Aura was offensively inclined, so relying solely on fusing Blood Fiend Aura with Vajra Force, Li Fei would find it extremely difficult to create a defensive type of force no matter how he modified it.
But with Wu Earth Yuan Evil Qi, that possibility emerged.
The corrosive nature of Blood Fiend Aura was quite close to the dark attribute of Wu Earth Yuan Evil Qi. Thus, Li Fei fused Blood Fiend Aura into Wu Earth Yuan Evil Qi, strengthening its dark attribute to the extreme and using it as the core of his new force.
He then fused the earth attribute of Wu Earth Yuan Evil Qi with Vajra Force, reinforcing its defensive properties.
Originally, accomplishing all this would have required Li Fei to spend some time researching it slowly. However, his battle with Guan Haoxuan had given him inspiration.
Imitating the Dao Force Abyssal Devour used by Guan Haoxuan, Li Fei created an entirely new force—the Primal Dark Vajra Force!
It took Wu Earth Yuan Evil Qi as the main component, with Blood Fiend Aura and Vajra Force as supplements.
The strongest True Blood Force Li Fei had created back then had fused Blood Fiend Aura converted from seven Blood Souls.
Now that he had refined this Primal Dark Vajra Force, the Blood Fiend Aura fused into it had consumed twenty Blood Souls! Even if Li Fei did not use it, the converted Blood Fiend Aura could only exist inside his body for around ten minutes.
If he used it, it would probably be exhausted within dozens of moves, requiring him to consume more Blood Souls to convert into Blood Fiend Aura.
Thus, Primal Dark Vajra Force was not suited for prolonged battles.
On the arena, Gu Yuefeng completely drew his weapon. It was a Fifth-Grade Exotic