At the edge of the Abyss Outpost plaza, the original temporary container market had been leveled. In its place stood a massive "Bilateral Trade Hub" spanning the Netherworld portal and the scorched earth of the Abyss.

  This wasn't just a market; it was a technological miracle, and the fruit of the Netherworld R&D Department's countless lost hairs.

  Rewind to three days ago.

  Netherworld, First Research Institute (formerly the Bridge of Helplessness Maintenance Department).

  Singularity stood on the podium, holding that multifunctional stylus, banging on the blackboard loudly. Below sat dozens of Ghost Messenger engineers with dark circles under their eyes, darkened foreheads, some even hovering on the edge of an out-of-body experience.

  "Listen! I know you want to die (although you've already died once), but not now!"

  Singularity pointed to the complex "Yin-Yang Energy Neutralization Chart" behind him.

  "Over in the Abyss, there are mines, specialties, and high-energy materials we urgently need. Here in the Netherworld, we have spirit money, incense, and tons of unsellable Aunt Meng's Soup stock."

  "This is a trillion-level business! It's the key to whether King Yama can pay off the Celestial Court's usury!"

  "The biggest problem right now is: the living (Spirits) cannot touch death energy, and the dead (Ghost Messengers) cannot touch Yang energy. One touch and they explode, one touch and they die."

  "So, I give you 72 hours. I want to see a set of perfect, low-cost, mass-producible 'Yin-Yang Isolation Protective Suits'!"

  "If you can't make it, everyone goes to the Eighteenth Layer of Hell to experience the VIP package, no negotiation!"

  The engineers let out a wail of despair, then pounced on their workbenches like zombies.

  72 hours later.

  On the Abyss plaza, the first batch of Ghost Messengers wearing silvery-white, bulky equipment that looked like spacesuits walked tremblingly out of the portal.

  This was the result—[Yin-Yang Isolation · Fully Enclosed Life Support System v1.0].

  This suit not only isolated the toxic gas of the Abyss and Yang energy but also internally looped the *Great Compassion Mantra* to stabilize the Ghost Messengers' souls.

  Across the counter, the Spirit merchants also put on specially made "Spirit Protection Wristbands," which could form a thin energy membrane to prevent erosion by Yin energy.

  "Come and look! Authentic Abyss Demon Dragon ribs! Just salvaged from Lord Slayer's blade! Extremely fresh!"

  A Spirit peddler waved a huge bone still dripping with magma, shouting at the row of Ghost Messengers in spacesuits.

  This tale has been pilfered from Royal Road. If found on Amazon, kindly file a report.

  The Ghost Messengers' eyes went straight. This kind of ingredient filled with tyrannical energy was simply a perfect tonic for ghosts.

  "I want it! Give me two tons! Swipe my Yama Card!"

  "Boss! How much for those 'Hellfire Peppers' over there? I want to take them back to spice up Ox-Head and Horse-Face's meals!"

  Trading was unusually booming.

  The Slayer sat on an ammo box not far away, changing the coolant for the BFG.

  He paid no attention to the noise over there. As long as no one caused trouble, as long as no one blocked his way, he didn't mind what these insects were doing.

  He just occasionally looked up at those Ghost Messengers in bulky protective suits moving comically.

  His finger gently rubbed the trigger.

  Although these Ghost Messengers were weak, at least... they understood the rules.

  On the other side.

  Netherworld, Hall of King Yama.

  King Yama sat on the dragon throne, looking at the huge holographic screen in front of him, where the "Trade Surplus" curve was skyrocketing like a rocket.

  "Hahahaha! Good! Good!"

  King Yama was so excited that he squeezed the iPad in his hand until it creaked.

  "My debts... there is finally hope to pay them off!"

  "Minister Singularity is indeed a talent for managing the world! This Abyss is not a dangerous place at all; this is clearly a cornucopia!"

  King Yama waved his large hand, ordering the Judge below the stage:

  "Pass on my decree! Immediately develop the 'Abyss One-Day Tour' project!"

  "Don't those ghosts bored to death in the City of Innocent Death shout every day that it's boring? Let them go to the Abyss to see! See how harsh the environment is there! See how ferocious the demons are there! Let them know how good the Netherworld is!"

  "And..." King Yama lowered his voice, a merchant's slyness flashing in his eyes, "I heard that the Spirits over there are also very interested in our Netherworld? Then open up the 'Netherworld Cultural Tour'! Take them to see the Bridge of Helplessness (Light Bridge Version), see the Home Viewing Terrace (5G Version), and sell some Aunt Meng's Soup as souvenirs!"

  "Remember! Charge double for tickets! Calculate the exchange rate at 1:10!"

  ...

  Abyss Plaza.

  The Slayer finished changing the coolant.

  He stood up.

  A few daring Spirit children, wearing protective suits, were lying on the edge of the safe zone, staring eagerly at the gloomy portal in the distance.

  "Is that the world of the dead over there?"

  "I heard there is endless 'incense' to eat there?"

  "I heard the water there (River of Forgetfulness) is sour?"

  The Slayer walked past them.

  He didn't shoo them away.

  He just glanced at that portal.

  On that side of the door was order, the tranquility of death.

  On this side of the door was chaos, the struggle for survival.

  Now, these two worlds were connected.

  Because he pulled out the "stopper" (Patriarch of the Blood Sea) blocking the way.

  The Slayer didn't care about the economy, nor about tourism.

  He only cared about one point:

  Will this flow bring new... trouble? Or rather, new prey?

  He shouldered the BFG and walked to the other end of the plaza.

  There, Singularity was directing a group of Spirit craftsmen to carry out the final reinforcement on that huge portal.

  "Great Hero! You came just in time!"

  Singularity's face was oily, excitedly pointing at the huge buzzing light ring.

  "Trade is running, but this door is still a temporary worker! The stability is too poor; only a few hundred people can pass through a day."

  "To welcome the upcoming 'Double Eleven Abyss Shopping Festival' (just kidding), we need to upgrade it to a permanent version!"

  "But this requires a stronger 'Core' to suppress spatial fluctuations..."

  Singularity rubbed his hands, but his eyes kept glancing at the Slayer's waist pouch.

  The Slayer knew what he was looking at.

  He reached out and pulled out the Black Hole Engine Core from the dimensional pocket, which he had dismantled from the "Mechanical Glutton," still frantically devouring the surrounding light.

  Singularity's eyes went straight.

  "That's it! With this, this door can stay open for ten thousand years!"

  Stability vs Flow.

  To allow circulation between two worlds, the road must first be built hard enough.

  The Slayer threw the core over.

  *Next Chapter: Portal Upgrade. Singularity wants to change this illegal temporary door into a magnificent interstellar pass. The Slayer says: Just don't block me from going out to kill monsters.*