Full health is the kill threshold, no matter if you're a god or a demon!

As Liu Nian killed enemies, he watched his level climb rapidly, feeling incredibly pleased with himself.

This wave of vampire invasion was also a good opportunity for him. If it weren't for the vampire attacking the city, how would he have had the chance to grind monsters so recklessly in an eighth-level main city?

Of course, the undead garrison wasn't so happy; they were basically slaughtered indiscriminately!

When Liu Nian finally turned into a wider corridor, he finally encountered a worthy opponent.

At the end of the corridor stood a massive mechanical undead.

It is about five meters tall and looks like a beetle magnified countless times. Six mechanical legs support its heavy metal body, and a twin-mounted energy cannon is carried on its back.

Its head is a semi-circular metal dome, beneath which a rotting skull can be vaguely seen, with dark red will-o'-the-wisps burning in its eye sockets.

【LV880 Construct Destroyer Salah (Legendary BOSS)】

The moment Salah saw Liu Nian, the twin energy cannons on his back began to charge.

Two dark purple energies condensed at the muzzle of the cannon, and in the blink of an eye, they expanded to the size of a washbasin.

"Intruder... die!" Salah's voice came from under the metal shield.

Boom! Boom!

Two energy blasts were fired simultaneously, one to the left and one to the right, blocking Liu Nian's evasion route.

How could Liu Nian possibly escape?

He charged towards the energy blast.

The first energy blast hit the shield, exploding into a cloud of dark purple sparks, but the shield remained completely still.

The second shot followed closely behind, but it was also blocked by the shield.

Liu Nian appeared behind the BOSS with a stealth attack. His energy, holy wrath and battle spirit were already full along the way!

It's just as bad luck for this BOSS. Liu Nian has been unstoppable all the way and has been getting a bit of a nuisance, so this time he's trying a different trick.

A deliberate, powerful punch!

Boom~~~

-849 billion!

A huge white true damage number popped up.

Salah's massive body stiffened for a moment before collapsing with a thud.

[Defeat LV880 Construct Destroyer Salah (Legendary Boss)]

[Big Eater Level +1]

One look and they're done for!

Liu Nian put away his spoils and was about to continue forward when a "crack" sound suddenly came from the area behind the BOSS where the aftershock of his deliberate punch had struck.

It then shattered with a loud crash, revealing a large, dark hole behind it, from which one could faintly hear the hissing sound of air flowing.

He stepped forward and peered into the hole.

It appears to be a huge pipe, at least three meters in diameter, with silver-white metal walls covered with fine patterns.

"what?"

A scene suddenly flashed through Liu Nian's mind.

Back when he was exploring that AI vehicle in the Battlefield of the Heavens, didn't he also fall into the pipeline system from the shaft?

It seems he was tricked into falling into a shaft by the dragon demon Chayna... Of course, he also played along.

The shaft was teeming with cave monsters. Later, he even led his guild members to level up inside, until they discovered a complete pipeline system diagram in the pipes, found the route to the engine room, and discovered the dwarf Morse, whose state had been solidified into a divine descent.

If Gamir hadn't intervened and intercepted, he might have gotten his hands on the perpetual engine in that omnic vehicle for Morse!

Thinking of this, Liu Nian's eyes lit up.

If this city is indeed the legacy of the Star Gnomes—the core of the Omnic Ark—then in terms of design concept, its piping system should be very similar to that of the Omnic War Chariots.

In other words, the pipes below are likely also interconnected, leading to any corner of the pyramid!

Thinking of this, Liu Nian jumped down without hesitation.

The pipe runs vertically downwards for about thirty or forty meters. After it lands, Liu Nian sees rows of tiny indicator lights embedded in the pipe wall, emitting a pale blue light that illuminates the pipe.

A faint smell of ozone permeated the air, and occasionally a buzzing sound of electricity could be heard from afar.

Liu Nian walked along the pipe, and after walking a short distance, he suddenly heard a loud "boom" from ahead.

Immediately afterwards, a stream of scorching air surged out from deep within the pipe, carrying with it a blinding blue arc of electricity.

It's an energy surge!

Liu Nian frowned, and blue arcs of electricity swept across him.

This thing also ignores defense and magic resistance, instantly wiping out 50 billion of Liu Nian's health!

Liu Nian frowned. If an ordinary player encountered this, they would probably be doomed.

After the energy surge passed, Liu Nian continued walking forward.

The piping system was more complex than he had imagined, with branching paths one after another, some leading to the upper levels, some to the lower levels, and some with unknown destinations.

He also encountered several waves of enemies—not undead, but those self-destructing robots and large numbers of obstacle-clearing robots, which emerged from various branches of the pipes, buzzing towards him, and were then blasted apart one by one by him.

Of course, the biggest threat is the energy surge, which occurs approximately every minute and can cause damage ranging from 5 billion to 10 billion.

After walking for about ten minutes, Liu Nian stopped at a pipe junction.

On the wall, there is a glowing metal plaque with a floor plan of the piping system.

The map is densely marked with the routes of the pipes, nodes, valves, and—the engine room!

Liu Nian summoned Arachne and Caron, explained the situation to them, and the two, whose professional knowledge far surpassed Liu Nian's, immediately began to study it.

Soon, Caron said:

"Master, according to the markings on this map, there are five engine rooms as you mentioned!" Caron's voice carried a hint of surprise, "distributed across different levels of this pyramid."

Five?

Liu Nian raised an eyebrow.

He remembered that there was only one engine room in the intelligent combat vehicle.

But thinking about it, it makes sense – this is an eighth-level main city, many times larger than the mechanized war machine, so five engine rooms are not an exaggeration.

"So, there are at least five eternal engines in this city?" Liu Nian asked.

"That's probably true, but there should be a hierarchy among them!" Arachne said. "Each engine room corresponds to a different functional area; some are responsible for energy supply, some for weapon systems, and some for defensive magic arrays..."

"Master, the nearest engine room is in this direction," Caron pointed to a mark on the map, "about two kilometers away."

Liu Nian glanced at the map, then at another marker.

That marking was larger than the other four, so it was clearly the core engine room.

"Let's not go to the closest one," Liu Nian said. "Let's go to the biggest one."

Kalon paused for a moment: "Master, the core engine room is on the lowest level, about 30 kilometers away, and you have to pass through at least six levels of areas in between."

"I know," Liu Nian said, "but we need to race against time with the enemy, and we also need to race against the vampires!"

Liu Nian didn't want to go through all that trouble only to end up with a one-time use right to a city teleportation array; that would be a huge loss!

So, he has to figure out a way to get rid of this biggest engine!

If we can get our hands on that thing, well, we'll make a killing!

Caron was silent for a moment, then nodded: "Master is right."

"Then it's settled." Liu Nian glanced at the holographic map again, memorizing the route. "I'll travel in my Celestial Body; you guys come back first!"