Chapter 660: Stay by Your Side

Guo Yao nodded, gripping Li An's hand tightly, a determined light flashing in her eyes: "No matter what happens, I will always stay by your side."

Just as Li An and Guo Yao prepared to face the coming crisis, a powerful energy fluctuation suddenly surged from behind them. They whirled around, seeing only a black shadow dart toward them like a phantom.

"Watch out!" Li An roared, swiftly pulling Guo Yao aside to dodge.

Yet the shadow's speed was far greater than they had imagined. Like a bolt of lightning, it caught up with them in an instant. Li An and Guo Yao managed only a single punch and a single kick before colliding with the shadow.

"Bang!" A deafening crash echoed as Li An and Guo Yao were blasted backward. They hit the ground, rolling several times before barely regaining their footing.

"What is that thing?" Li An rubbed his aching chest, glaring fiercely at the black shadow ahead.

The shadow slowly revealed its true form: a mysterious figure clad in a black robe. A silver mask covered his face, revealing only a pair of cold, sinister eyes.

"You actually dared to activate the Ancient Key? You are asking for death." The mysterious figure's voice was as piercing as ice.

Li An and Guo Yao exchanged a glance, seeing determination in each other's eyes. They knew this mysterious figure would never let them go.

"Hmph. Since we dared to activate the Ancient Key, we have the confidence to face any challenge." Li An snorted coldly, rising to his feet once more, ready to fight.

The mysterious figure looked at Li An and Guo Yao, a cold sneer curling his lips: "You think you can defeat me with such meager strength? How laughable."

With that, the mysterious figure swept his hands, and waves of black energy radiated from his palms, surging toward Li An and Guo Yao.

Li An and Guo Yao dodged the attacks swiftly, simultaneously searching for an opportunity to counter. Yet the mysterious figure's assaults grew ever more ferocious, leaving them barely able to breathe.

"This won't work." Guo Yao panted.

Li An nodded, clenching his fists as a fierce fighting spirit surged within him: "We must find his flaw, or we will all be defeated by him."

With that, Li An charged at the mysterious figure again. He swung his fists, engaging the mysterious figure in a fierce battle. Guo Yao followed closely behind, her hands dancing in the air as mysterious runes continuously flew toward the mysterious figure.

Yet the mysterious figure's strength was extraordinarily powerful; he effortlessly deflected Li An and Guo Yao's attacks. Moreover, his assaults grew ever more savage, placing immense pressure on both Li An and Guo Yao.

"No good. We must change tactics." Li An panted.

Guo Yao nodded, looking at Li An, a determined light flashing in her eyes: "Let us use the Fusion Power together and see if we can break through his defense."

Li An nodded, once again taking Guo Yao's hand and merging their powers. Then, they launched an attack in a completely new way, charging fiercely at the mysterious figure.

Seeing this, a flicker of surprise crossed the mysterious figure's eyes. However, he quickly adjusted his state, preparing to meet Li An and Guo Yao's assault.

"Bang!" A deafening crash rang out as Li An and Guo Yao's attack collided with the mysterious figure's defense. This time, their attack finally took effect. A gap was torn in the mysterious figure's defense, and his form staggered slightly.