Xu Liehuo suddenly felt power surging through his entire body, and every strike of his sword grew sharper and more ferocious.
In a short time, the Fire Domain Sovereign was forced into retreat again and again by them.
"Impossible! How can you both be this strong?" A flicker of fear flashed through the Fire Domain Sovereign's eyes.
But he was still a peak-level expert of the Marrow Refining Realm, and he quickly stabilized his stance.
He sneered coldly, and the flames on the Burning Heaven Emperor Sword suddenly burned brighter, as if they were about to melt the entire cavern.
"Fools, traitors—do you really think this is enough to defeat me? How laughable!"
The Fire Domain Sovereign burst into mad laughter as the Fire Phoenix on his Burning Heaven Emperor Sword flew out, transforming into a streak of fire that charged straight at Xu Liehuo and Su Xian.
