With the addition of Blood Skull Immortal Gu, the originally ordinary Blood River Great Formation instantly underwent a qualitative change, directly elevating to an Immortal Dao Great Formation. However, Liu Chen knew that such a Rank six Immortal Formation was still far from enough for the powerful desolate beast Sword Dragon.
Thus, Liu Chen, without hesitation, once again activated a Rank seven Stream Immortal Gu, throwing it into the Skeleton Blood River Great Formation. The addition of this Rank seven Stream Immortal Gu was like injecting powerful vitality into the entire great formation.
The Blood River instantly surged, and the originally calm river surface seemed to be stirred by a huge force, forming streams of blood. These streams intertwined like a spider web, tightly weaving the entire Blood River Great Formation together.
And the blood-red skulls that were originally suspended above the Blood River now seemed to have been endowed with new power, their devouring ability increasing by dozens of times. Each skull was like a small blood pool, continuously devouring the desolate beast Sword Dragon's blood.
The desolate beast Sword Dragon's blood now seemed to have lost control, gushing out like a torrent from the five shallow wounds. Those five wounds were like five breached dams, blood pouring down like a waterfall.
"Roar ~"
Even instinctive Dragon's Breath could not be used continuously. The Sword Dragon clearly felt its blood continuously draining from its body, which filled it with panic and anger.
In its fury, the Sword Dragon twisted its body wildly, its immense power stirring the surrounding air, forming a terrifying Sword Blade storm.
This storm advanced at an astonishing speed, directly rushing into the Blood River, seemingly wanting to destroy the Skeleton Blood River Great Formation in one fell swoop.
However, despite the Sword Dragon's extremely powerful offensive, the Skeleton Blood River Great Formation remained unmoving, like an indestructible fortress.
No matter how the Sword Dragon cut off the Blood River, the severed parts would quickly return to their original state. This great formation possessed the ability to self-repair, just like cutting water with a knife only makes the water flow more.
The tide of battle instantly reversed. The desolate beast Sword Dragon, which had originally held the advantage, was now helpless against the Blood Dao Great Formation. Its incomparably sharp attacks seemed so powerless in front of the Skeleton Blood River, unable to cause any substantial damage.
As time passed, the Sword Dragon's blood was continuously drawn, and its power gradually weakened. Finally, the Sword Dragon let out a wail, a sound filled with despair and unwillingness.
Then, its body slowly fell, landing in the Skeleton Blood River, becoming a dried corpse devoid of any blood.
With the death of the desolate beast Sword Dragon, Liu Chen finally breathed a sigh of relief. This tribulation had, after all, been successfully overcome with no serious mishaps.
The Skeleton Blood River Great Formation, under Liu Chen's exquisite control, slowly ceased operation. The originally surging Blood River also gradually calmed down, as if nothing had ever happened.
And the desolate beast Sword Dragon's blood, like a torrent, continuously gathered into the Blood Skull Immortal Gu.
The Sword Dragon's blood, purified by the Blood Skull Immortal Gu, was filled with Sword Dao Dao marks. Its quality was so high that it was sufficient to serve as the main material for a Rank seven Immortal Gu recipe!
As the Immortal Gu was successfully recovered, the Skeleton Blood River Great Formation also seemed to have completed its mission, returning to the appearance of a mortal Dao Great Formation. Immediately after, Liu Chen's mind stirred, and this mortal Dao Great Formation, like dismantled building blocks, quickly transformed into individual formation Gu, which he put into his possession.
Liu Chen slowly descended from the sky, finally landing steadily beside the Sword Dragon's corpse. He looked closely and was surprised to find that the desolate beast Sword Dragon's body was incredibly rich in Dao marks, to an extent that it could even rival Rank seven immortal materials!
"It seems that this Sword Dragon's terrifying combat power can probably be attributed to this Immortal Gu," Liu Chen secretly sighed in his heart.
Just then, a Rank six Immortal Gu suddenly appeared in his hand. This was the one that Formless Hand had snatched from the Sword Dragon.
The appearance of this Immortal Gu was like a long snake, entirely silver-white, with a slender and long body, like a silver thread. Its head was round, and its mouth was extremely large; when opened, one could see it was covered with sharp fangs, densely arranged, occupying the entire oral cavity, making one shudder.
With the various Legacy memories Liu Chen had acquired, he pondered for a moment and finally figured out the origin of this Immortal Gu. It turned out to be an extremely rare Rank six Sword Devouring Immortal Gu! This Immortal Gu was not only a Sword Path Immortal Gu but also a Food Dao Immortal Gu. It could enhance its own Sword Dao Dao marks by devouring Sword Dao immortal materials.
This made it easy to explain why this desolate beast-level Sword Dragon could possess the combat power of an ancient desolate beast. It was likely because it had devoured a large amount of Sword Dao immortal materials, thereby accumulating a powerful body of Sword Dao Dao marks. Even its own corpse could be considered a Rank seven immortal material, which was undoubtedly because it had devoured countless Sword Dao immortal materials during its lifetime, causing its body to contain such immense Sword Dao Dao marks.
This was also the fundamental reason why that Sword Dragon was not afraid of Liu Chen's Sword Dao killer moves. It was likely that the Sword Qi Liu Chen landed on it would be swallowed by this Immortal Gu as a delicious snack.
If there were no other means to restrain this Sword Dragon and allow it to continue growing, it would probably become the nightmare of all Sword Path Gu Immortals in the world.
Now that this Sword Devouring Immortal Gu had become his possession, it was undoubtedly like adding wings to a tiger for his future cultivation path.
"What good fortune!" Liu Chen couldn't help but exclaim in his heart.
After successfully refining this Sword Devouring Immortal Gu, Liu Chen deeply lamented the powerful auxiliary effect brought by good fortune. Although he faced numerous crises during this Undergoing Tribulation process, the final gains were equally immense.
"Land As Before!" Liu Chen murmured softly, simultaneously manipulating the anti-counterfeit Immortal Gu, causing it to instantly transform into Land As Before Immortal Gu. He aimed this Immortal Gu at the immortal aperture below, which had been ravaged beyond recognition by the desolate beast Sword Dragon, preparing to begin repair work.
However, because Liu Chen was not a Time Path Gu Immortal, the mutual repulsion between Dao marks meant that his repair effect was not as satisfactory as desired. Fortunately, he had ample green grape immortal essence, which allowed him to continuously activate Land As Before Immortal Gu, enabling the repair work to proceed continuously.
In this way, Liu Chen unhurriedly controlled the green grape immortal essence, little by little repairing the damaged immortal aperture. Although progress was slow, with his unremitting efforts, this area eventually gradually returned to its state before the Undergoing Tribulation.
Aside from the consumed green grape immortal essence, Liu Chen did not suffer any other losses during this Undergoing Tribulation process.