Buzz.

The next moment, the whole space was engulfed by darkness. Above them, countless stars spread across the sky, making it seem as if they stood within a vast starry expanse.

"The Starry Sky Domain..."

Long Yun smiled faintly at the sight and snapped his fingers.

Snap!

Within the dark starry sky, a blazing sun appeared. It illuminated the void and turned night into day. The sun clashed against the starry sky and even seemed to gain the upper hand.

Whoosh...

Suddenly, a storm raged faintly within the dark sky. Long Yun snapped his fingers again. A towering mountain descended from above, blocking the storm. No matter how fiercely it raged, the mountain did not budge at all.

Lu Changsheng's Mind Space trembled. A hundred-zhang wave surged forward. Long Yun remained calm. He pointed ahead, and the temperature dropped at once. A biting cold filled the void, and the oncoming wave froze solid, hanging in place.

The exchange left everyone watching in awe. Even the Immortal Masters could not hide their amazement.

"Their Domains are incredible. What a fight! This is a true clash of Domains."

"Yeah, so many Domains are colliding, and Long Yun has been bringing out just the right one to counter Lu Changsheng. That level of confidence and composure does not belong to an ordinary Divine Treasury martial artist."

"Long Yun truly deserves his title as one of the top Divine Treasury experts. He's a renowned true inheritor of the Yellow Heavenly Sect. Compared to someone who just broke through like Lu Changsheng, he does have the edge."

"Exactly. Long Yun's handling everything with ease, countering move for move. But Lu Changsheng's no pushover either. He has recently reached Divine Treasury, but he can already stand toe-to-toe against Long Yun. That's seriously impressive."

"That is what a real Divine Treasury fight looks like. Ordinary ones aren't even close to these two..."

The clash between Lu Changsheng and Long Yun did not look especially violent. It was a contest of Domains, nothing more. Yet this was what a true battle between experts looked like. In fact, this was how battles ought to be fought.

Martial artists could fight with elegance. It was no longer about fists striking flesh or slashing out with sabers for the kill. At this level, everything came down to Domains and secret techniques.

Lu Changsheng had finally met his match. For every Domain he used, Long Yun could find a way to counter it. As a result, his Domains were being restrained.

Buzz.

Lu Changsheng released both the Saber Domain and the Sword Domain—his strongest offensive Domains.

"Oh? You have the Saber Domain and the Sword Domain as well. What a coincidence. So do I."

Long Yun smiled and released his own Saber Domain and Sword Domain. This was the advantage of his long years of cultivation. He had been cultivating for a very long time. Even through slow incremental progress, he accumulated many Domains, raising his overall strength.

"Five Domains now..."

Lu Changsheng unleashed five Domains in succession, yet none could break through Long Yun's defense. In contrast, Long Yun had already revealed more than a dozen Domains. And those were only the ones on display. Who knew how many more he had?

Lu Changsheng stopped holding back.

Buzz...

He released his sixth Domain, the Waterfall Domain. A massive waterfall descended within the starry expanse. The moment it appeared, he made his move.

"Fuse!"

BOOOMM!

The Starry Sky Domain and Waterfall Domain fused at once, forming the Starry Sky Waterfall Domain.

The waterfall expanded a hundred times. What had seemed to be a hundred-zhang-tall waterfall surged into a towering cascade that filled the firmament. When it crashed down, it tore through one of Long Yun's Domains.

Long Yun had seemed completely at ease, as if everything were under his control. The moment Lu Changsheng fused his Domains, his expression changed sharply. "Not good... this is a fused Domain!"

A fused Domain was not a simple matter of one plus one equaling two. It was closer to one plus one becoming eleven.

Within moments, the waterfall crashed down and tore through layer after layer of Domains.

One layer, two layers, three layers, four layers, five layers... The five Domains that Long Yun had deployed were all torn apart. With a wave of his hand, ten more appeared. In total, he brought out fifteen layers of Domains.

Rumble...

The Starry Sky Waterfall churned and tore through six, eight, and ten layers of Domains before losing its power and collapsing, eliciting a sigh of relief from Long Yun.

"That's one monstrous fused Domain... but I've got fifteen layers of Domains. Even with that, you cannot break through them! Watch me! RESTRAIN!" Long Yun exclaimed, moving decisively. He gathered all fifteen Domains and brought them down together, using their combined force to restrain Lu Changsheng.

Lu Changsheng's Starry Sky Waterfall Domain collapsed instantly, along with his other Domains.

"Fifteen Domains?" Lu Changsheng did not panic. If one fused Domain could not break through ten layers, then what about two fused Domains?

"SEVEEER!" Lu Changsheng sent out his Heart Sword, and it pierced Long Yun.

"A mental secret technique? A mental barrier!" Long Yun was indeed well-rounded. Aside from his fifteen Domains, he even had a mental defense technique. Although such a technique could not be nurtured within the Mind Space, it still provided protection for the mind.

However, Lu Changsheng's Heart Sword had already undergone a transformation. The Jade Heart Sword could even materialize, and its power was terrifying. It struck the mental barrier, shattering it instantly with a crack.

BOOOM!

Long Yun's mind shook violently, and a sharp pain surged through his head. The mental barrier absorbed most of the Heart Sword's power, but the remaining force was still strong. Fortunately, it was not enough to shake his spirit. Still, the pain was real, and Long Yun's control over his fifteen Domains loosened. That split instant was enough for Lu Changsheng to counterattack!

"Domain Fusion, Waterspout Domain!"

"Domain Fusion, Starry Sky Waterfall Domain!"

In the proverbial blink of an eye, Lu Changsheng fused four Domains into two. The first to form was the Waterspout Domain. It surged forward with overwhelming force and swept through everything in its path, crushing nearly ten of Long Yun's Domains in one strike. Then the Starry Sky Waterfall Domain descended once more.

Eleventh layer, twelfth layer, thirteenth layer, fourteenth layer, fifteenth layer... Finally, all fifteen Domains were crushed by the Starry Sky Waterfall Domain. Long Yun felt death closing in on him. It pressed on against him, as if it could claim him at any second.

"Impossible..." Long Yun could hardly believe what he was seeing. What the—Two fused Domains?!

Even his mental technique was incredibly powerful, so powerful that Long Yun's mental defense technique could not block it completely. Moreover, fused Domains were not something any martial artist could create at will.

Still, Long Yun had been cultivating for many years. Given enough time, a martial artist could develop Domains with the specific intent. With the right approach, it could lead to fusion. Long Yun himself had one fused Domain of his own.

It was his trump card, and it was something he had almost never revealed. In the Ancient Region, martial artists would always have a hidden trump card. Even his friend, Xu Haotian, did not know about it. Now, he no longer had a choice but to unleash it. If he were to keep it hidden, he would die!

"Domain Fusion. Ice Snow Domain."

Just then, snow descended through the void. This was his sixteenth Domain, the Snowflake Domain. He rarely used it because he feared others would connect it to his fused Domain. Now, he released it without reservations. The Snowflake Domain fused with his Ice Domain and formed the Ice Snow Domain.

Domain Fusion wasn't a mere addition. It multiplied power far beyond the sum of its parts. Even if weaker fused Domains could not amplify one's strength by ten times over, they could still boost one's power by seven or eight times.

Hence, when Long Yun unleashed the Ice Snow Domain alongside more than a dozen other Domains, even Lu Changsheng's two fused Domains could not completely overwhelm it.

For a moment, Lu Changsheng and Long Yun reached a stalemate.