No matter who the cultivator is, as long as they reach the Early-Stage War God Realm, after their True Qi transforms into Gang Qi, they can burn the essence of Gang Qi to unleash combat power far surpassing their usual capabilities.
However, the disadvantages of doing this are also apparent. After burning the essence of Gang Qi, one will suffer severe damage to their Primordial Qi, requiring a long time and effort to replenish the lost Gang Qi essence, and they might even fall from their realm!
In severe cases, just like Chu Xuanji before, they might fall from their original realm, nearly becoming a cripple. Therefore, unless absolutely necessary, cultivators are unwilling to burn the essence of Gang Qi.
But now, Lv Yuan and the others have no choice. If they don't desperately burn the essence of Gang Qi, not only will they fail to hold back this top-level War God-level mutant beast, they won't even be able to escape.
