The Nine Provinces cultivation world's expedition against the Blood Refinement World, strictly speaking, was not a fair war, as the Nine Provinces side had long been planning and arranging, whereas the Blood Refinement World was completely unprepared.
Thus, even though the two domains were almost equal in size and cultivators' levels, when the war erupted, the Blood Refinement World was overwhelmingly defeated.
Whether it was the Empyrean Sea battle or the clashes between cultivators of both races in various places of the Blood Refinement World, the Blood Race was at an absolute disadvantage.
Ultimately, where is fairness in matters of war? It was a clash of two domains, a rivalry between two races. The human race held intelligence advantages and had substantial support from the Nine Provinces Heaven's Augury, hence they could advance like a hot knife through butter, unstoppable.
