Drops of dark red blood dripped onto the mottled skull, and then the skull began to tremble, and bursts of crackling sounds came from behind the stone wall.

Seeing this, Viscount Mo Ruo and the butler looked at the stone wall intently, waiting for some changes to occur.

But after a few minutes, the noise gradually died down until it returned to calm.

"Same as yesterday." Viscount Mo Ruo frowned and slapped the wall in annoyance.

What went wrong? He pondered over it in his mind, and then recalled the information he had found in the classics over the years.

The device before him was clearly a bloodline seal, capable of being unlocked only by those of a specific bloodline. While such a structure was rare today, it had once been prevalent in the distant past.

To trace the origin of this secret art, we have to mention the era of the first human empire, the True Red Empire.

In that empire that excels at the demon sequence, various blood-related mystical arts flourished, and the original nobles were also proud of their own bloodline, so they invented this thing that could verify the bloodline of their descendants.

Unfortunately, this art gradually declined during the Mercury Dynasty. Compared to an empire ruled by bloodline, the Mercury Dynasty was more like a union of necromancers, placing greater emphasis on master-disciple inheritance than bloodline. Consequently, the use of this art became less and less common, until after the Mercury Dynasty's dissolution, these ancient arts were lost in war and disaster.

Now he found this thing again in the ruins. After continuous research and experiments, he finally set his target on the remnants of the Mercury Dynasty.

After the collapse of the Mercury Dynasty in the Second Age, many descendants of the original dynasty were exiled to the Isle of Everdarkness. This situation continued until the Chaos Disaster at the beginning of the Third Age.

Because the necromancers played a role again during the disaster, the human leaders no longer continued to suppress this small sequence, and some survivors of the Eternal Darkness Island were able to return to the mainland. A large number of them were assigned to the barren and desolate northern border of the empire. The most famous and representative of these survivors is the Treyi family, which uses the gray raven as its emblem.

It was the army of undead led by this family that finally captured the immortal magical city of Odyssey in the war between the Verdant Empire and the Land of Oz.

After the war, the survivors of Everlasting Darkness Island returned to the barren northern border, but a few of their bloodlines remained in the southern border. Perhaps they were the product of a temporary love during the war, or perhaps they were greedy for the warm climate of the southern border, so a small number of people finally stayed secretly.

Viscount Mo Ruo spent a lot of time checking one by one, and finally found the girl who was about to be executed in the prison in Longyi Province.

According to the obscure records of her ancestors, they are the survivors of the Eternal Dark Island, so they also have the blood inherited from the Mercury Dynasty flowing in their veins.

Why does the mechanism behind the wall stop responding after rotating and vibrating? Is it because the bloodlines don't match?

Viscount Mo Ruo pondered this idea slowly but rejected it. This girl's bloodline was genuine. Perhaps after hundreds of years of living on Everdark Island, the islanders had intermarried, and their bloodlines had long since become mixed. She must have some of the bloodline of those mercury wizards back then.

Is it because the purity is not enough? Perhaps so, but where can one find pure-blooded descendants of the Mercury Dynasty these days? Even the Trey family, after so many years of intermarriage, cannot be said to be absolutely pure.

Viscount Mo Ruo pondered, looking at the blood-stained skull lying motionless on the stone wall.

After a long time, he slowly lowered his hand from the wall, put away the holy white ball, and walked out of the square passage again.

"Master?" the butler asked doubtfully.

"Let's go back first." He looked at the bloodstains remaining on his palms, and a message he saw in the past slowly emerged in his mind.

It is said that during the time of the True Red Empire, there was a secret technique for purifying blood. Although this technique was first used on Warcraft to extract blood to make potions, it might be worth a try now.

The only obstacle was that he needed to think carefully about where he had seen this information.

I guess I have to go through the entire family library again this time.

Thinking about something in his mind, Viscount Mo Ruo walked ahead silently until he returned to the ground again. The edge of the sky gradually revealed a cold white.

Another new day has begun.