High-level martial arts: Contract cashback, invincible starting from the Zerg.

As the heavy alloy door of the training room slowly closed behind us, the moment the dull thud of the latch locking shut, the entire secret room was completely isolated from the outside world.

As the energy circuits embedded in the walls gradually glowed with a pale blue light, spreading throughout the entire space along the pre-designed pathways, the pure Tia energy began to flow continuously into the center of the secret chamber.

Chen Feng slowly withdrew his gaze, no longer looking at the thick, drifting cultivation resources in front of him. He sat cross-legged on the energy array eye in the center of the cultivation room, closed his eyes lightly, and began to cultivate with all his might.

As a burst of blue light enveloped Chen Feng's body, all the various energies within the cultivation chamber were activated, as if being rapidly drawn into a swirling energy vortex. The eye of that energy torrent was none other than Chen Feng's Vajra Core!

In the blink of an eye, the concentration of Tia's energy in the entire training room rose to ten times that of an ordinary training room, becoming so thick that it almost turned into liquid, and continuously flowed into Chen Feng's body.

If an ordinary mid-stage Heavenly Realm martial artist dared to cultivate in such a concentrated energy environment, their meridians would probably have spontaneously combusted, and with their blood and qi surging, they would at least suffer damage to their foundation, or at worst, explode and die.

However, Chen Feng remained calm and unperturbed...

With a slight shift in his mind, the Azure Dragon Armor on his body would occasionally appear, and the ancient dragon roar would faintly emanate from his flesh and blood.

This is the strongest inheritance among the soldier's body-forging techniques. Very few people can cultivate it to the third level. Even a talented expert like Chen Feng needs to rely on the bonus of luck to achieve it.

With the buffering and purification of the three layers of Azure Dragon Armor, the torrent of energy from the outside world, which was enough to crush a peak Heaven Rank cultivator, became only gentle nourishment on Chen Feng, gradually guiding it into Chen Feng's Vajra Core.

......

The second day of cultivation began.

Chen Feng's Vajra Core and physical body have completed the initial advancement, and have begun to condense strands of deep blue light.

This is the "Dome" in the Starry Universe plane world.

The difference in energy used by Desolate-Rank experts and Heaven-Rank experts.

Ordinary Heavenly Realm experts can only rely on their own talents and the ultimate use of Tia energy to form superb combat power. However, when a martial artist cultivates to the Desolate Realm, not only will they awaken a second combat talent, but they will also be able to give their Tia core and body the power to be attached to the rules, and use the "Dome" energy in the Starry Sky Universe.

In such combat conditions, martial artists will experience a significant boost in both their energy core and physical strength!

When "Qiongyu" lit up from the depths of the Vajra core, this faint light was like the sun rising into the sky, instantly illuminating Chen Feng's limbs and bones.

The Vajra Core accompanied Chen Feng step by step from Starfish City to the mid-stage of the Heavenly Realm. By now, it was as hard as refined steel and as stable as a rock, and it was also the source of Chen Feng's martial arts foundation.

However, after consuming a massive amount of pure Tia energy, the Vajra Core pulsated tens of thousands of times before finally producing a wisp of "Sky" energy, which was truly remarkable.

Chen Feng did not let his guard down and continued to invest his luck points, using the enhancement capabilities of the Luck Contract System to help the Vajra Core continue to transform "Universe" energy.

......

Over the next few days, that nascent cosmic energy, like a spark, took root firmly on the surface of the Vajra core. Each time cosmic energy was generated, it would entwine around the Vajra core.

At first, it was just a trickle of "Qiongyu" energy. As Chen Feng continued to cultivate, dozens of strands of Qiongyu energy had been wrapped around the Vajra Core, like fine, dark blue silk threads spreading out layer by layer along the Vajra Core, weaving a thin veil.

Chen Feng could clearly perceive it.

These most powerful energies, originating from the starry universe, are gradually transforming the core of the diamond in an extremely slow yet persistent manner.

Even the originally indestructible core structure began to deform and emit a faint, almost imperceptible deep blue halo under the influence of the "Dome" energy. Chen Feng also used his luck value at the right time to ensure the safety of the body's energy circulation.

Until the 10th day of the training process

The core of the diamond has been completely enveloped by the energy of the "Dome," forming a semi-transparent energy membrane.

Like a floating planet in a sea of ​​stars, that energy membrane is the atmosphere that surrounds the planet.

At this time, Chen Feng also learned the name of this core – "The Universe Core".

Chen Feng kept his mind focused on the core of the universe, not daring to relax even slightly.

Because at this moment he could already feel that the condensation of the cosmic energy no longer depended solely on the transformation of the core; Chen Feng's flesh, blood, meridians, and bones were all involved at this moment.

Every muscle expands and contracts in the energy tide, initially refining the Tia energy that has seeped into the body, and then undergoing triple purification by the Azure Dragon Armor, ultimately transforming it into "Sky" energy.

Chen Feng continued to invest his luck points without hesitation.

Under the faint light of the lucky contract amplifying its weaknesses, Chen Feng's "Cosmic Core" flickered incessantly, looking like a planet waging a full-scale war. The luck value acted as an invisible catalyst, constantly strengthening the core structure that should have collapsed and condensing the dissipated energy.

The entire advancement process is still proceeding without major incidents.

......

Until the eleventh day of cultivation

The deep blue energy has long since transformed into the energy layer on the outer surface of the "Sky Dome". The energy membrane has revealed mysterious and complex patterns, some like star trails and some like chains of rules. Each pattern flows with a profound light and exudes a faint pressure.

That was precisely the aura of the rules of the starry universe.

However, what concerned Chen Feng even more was that as the Qiongyu energy continued to strengthen and transform, it seemed to have touched an invisible barrier in Chen Feng's consciousness.

Behind the barrier, something seemed to be sleeping, but with each pulse of the "Sky Dome" core, a faint response could still be heard.

Chen Feng knew that it was very likely his second combat talent, which he would only awaken after advancing to the Desolate Rank.

Chen Feng was not in a hurry to break through that barrier of evolution.

He simply kept his mind focused and continued to activate the "Sky Core," refining Tia's energy into "Sky Core" energy, making the "Sky Core" increasingly thick and solid.

Meanwhile, the core of "Sky Dome," which had been growing slowly, also began to change.

The deep blue energy layer that originally enveloped the core of "Qiongyu" began to collapse continuously, as if it were being gripped tightly by an invisible hand. The core density increased exponentially, and the color began to change from deep blue to dark purple.