Undying Seal Divine Ability is quite unique. It's a passive Divine Ability. That means, Lin Fei cannot actively deploy it. This Divine Ability is intricately linked to his physical body. Once the Undying Seal is cultivated, it integrates into every inch of flesh and blood, becoming inseparable.

In some ways, this Divine Ability might be vital for Lin Fei's eventual birthright of the Martial King bloodline. Furthermore, among all the Divine Abilities within the Martial King bloodline, the Undying Seal is likely a unique one. Passed down through generations, awakening the Undying Seal Divine Ability in one's bloodline would certainly elevate it to one of the top-tier Divine Abilities at the Martial Sovereign level.

However, its cultivation is arduous. From the memories, Lin Fei found a clue. To enhance the Undying Seal, there are no shortcuts. His body must repeatedly approach the brink of collapse. It needs to be destroyed, or even annihilated, time and again. Perhaps only then can the cultivation of the Undying Seal progress.

But this approach is perilous. The physical body is the foundation of a Martial Sovereign. A minor mistake could result in real death. Finding the balance between body collapse without dying is not easy.

"Others might find it difficult to manage this balance," Lin Fei muttered, "A momentary lapse could result in death. Even if not fatal, it might cause severe damage, perhaps even harming the foundation. Especially since the beginner level of the Undying Seal isn't that strong yet. But if it's me, I should be able to control it."

The more he thought about it, the more it made sense to Lin Fei. To cultivate this Divine Ability, to improve the cultivation of the Undying Seal, he had to rely on himself. Besides, Lin Fei possessed the Saber Domain. So, he should be able to control this balance.

The method for Lin Fei to enhance the Undying Seal Divine Ability seemed simple - it was self-harm. Essentially, he would be cutting himself.

"Let's give it a try."

Lin Fei prepared himself immediately.

"Hum."

The next moment, he deployed the Saber Domain, placing himself within it.

"Whizz, whizz, whizz."

Sabers shot out from all directions, fiercely aiming at Lin Fei, who had dropped all defenses. He met the torrent of sabers with his bare body.

"Splurt."

The next moment, the sabers mercilessly struck Lin Fei, riddling him with wounds.

"Hmm? No effect?"

Lin Fei observed his body, covered in cuts and punctures. Under the passive influence of the Undying Seal Divine Ability, the wounds were rapidly healing. However, it seemed the desired effect was not achieved. The progress of his cultivation remained unchanged.

"Perhaps there were too few saber strikes, and the destruction to the body wasn't thorough enough," Lin Fei speculated. "What about using flames to burn? The flames can continually damage the body. Maybe that would be effective."

Lin Fei glanced around. He was on the fourth floor of the Martial Arts Tower. Using flames here might not be a good idea. What if he accidentally burned some Divine Ability manuals? Moreover, cultivating the Undying Seal Divine Ability wasn't an overnight task. So, Lin Fei left the Martial Tower and returned to his cave dwelling.

This story originates from Royal Road. Ensure the author gets the support they deserve by reading it there.

Inside his cave, Lin Fei had no reservations. He activated the Saber Domain.

"Fire!"

Immediately, the Saber Domain was ablaze. Lin Fei's body, stripped of any protective power, directly faced the roaring flames, allowing himself to be consumed by their intense heat.

Burning was excruciating. Even knowing he wouldn't die – after all, Lin Fei could control the intensity within his Saber Domain – the pain was beyond what most could endure. It required tremendous willpower!

Lin Fei resisted the burning agony, immersing his consciousness entirely within his body. He could clearly see the flames continuously scorching his body. Yet, the Undying Seal within him ceaselessly released life energy, replenishing what the body needed, or more precisely, the parts of his body that were burned by the flames.

Thus, Lin Fei's body underwent a cycle: burnt by flames and then healed by the Undying Seal.

Suddenly, a system notification echoed in Lin Fei's mind.

"Your Divine Ability, Undying Seal, continuously releases life energy, healing your physical injuries. Cultivation progress has increased by 1%."

Even though it was just a 1% increase in cultivation progress, Lin Fei was ecstatic. It meant his method and reasoning were correct. He could use the self-infliction method, pushing his body to the brink of collapse, and continuously boosting the cultivation progress of the Undying Seal.

Although it was only a mere 1% increase, it was achieved in less than half an hour. Moreover, Lin Fei hadn't been giving it his all. He had merely been testing. Now, having seen the results of his trial, Lin Fei knew his approach worked.

No longer holding back, he went all out, employing every means to "destroy" his own body.

One day, two days, three days... Time flew by, and the progress of Lin Fei's Undying Seal Divine Ability skyrocketed: 10%, 30%, 50%, 70%, 90%...

In just three short days, Lin Fei's Undying Seal Divine Ability advanced dramatically, reaching a full 100% cultivation progress. This meant that Lin Fei's Undying Seal Divine Ability had broken through!

"After several days of diligent cultivation, the cultivation progress of your Divine Ability Undying Seal has reached 100%."

"Your Divine Ability Undying Seal has broken through to Mastery!"

A system notification echoed in Lin Fei's mind. Simultaneously, Lin Fei's body underwent a drastic transformation. This passive-type Divine Ability, much like martial arts, promoted physical enhancement, significantly increasing defense. Now, his body possessed the capability of "Flesh Regeneration," a hallmark of achieving mastery in the Undying Seal.

"Flesh Regeneration..."

Lin Fei stretched out his hand and flicked a drop of blood from his finger. The blood droplet landed on the ground, but instead of dispersing, it pulsated as if alive. Remarkably, Lin Fei felt a connection to this droplet.

"Grow!"

At Lin Fei's command, the blood droplet rapidly expanded, turning into a pool that continued to wriggle and writhe.

"Return."

With a gesture, Lin Fei recalled the blood, and it swiftly returned to his body. With a mere thought, two more arms sprouted from his ribs, giving him a total of four arms. He even felt he could grow more if he wanted. The same applied to his legs. This was the power of Flesh Regeneration—a miraculous ability that allowed him to easily assume forms like "Three Heads and Six Arms."

However, every advantage has its drawbacks. The flames within his Saber Domain seemed to have lost their efficacy against Lin Fei's newly empowered body. With Flesh Regeneration in place and the accompanying bolstered defense, the flames felt as harmless as a tickle.

While the flames might not pose a challenge, Lin Fei had other Divine Abilities. Among them was one specifically designed to destroy the physical body: the Black Wind Prison, with its bone-eroding wind, capable of corroding flesh. Additionally, there was the Annihilation Divine Ability, also designed to wreak havoc on the body.

"Continue cultivating the Undying Seal!"

With resolute determination, Lin Fei extinguished the flames in his Saber Domain and summoned a chilling bone-eroding wind: the Divine Ability, Black Wind Prison. It enveloped him immediately, corroding his flesh, and revealing pale bone. Once again, his body was damaged, but the Undying Seal was constantly triggered, repairing his body and leading to continued progression in his cultivation.