Esper Harem in the Apocalypse

Chapter 824  How to Make a Portal

"But… you can teleport without any portal, right?"

"Yes. I don't need it for me. I need it for the girls."

"Oh." Lu Bela pondered for a few seconds. "What type of teleportation portal do you have in mind?"

"A kind of portal that can only be accessed one way."

"Now that's difficult."

"What about the device you had that your UnderBlades used when they kidnapped the Ross family? Wasn't it similar to a teleportal device?"

"It is, but using that is not ideal. You want a portal that can only be accessed from one way and it should always be active. The teleportation device I had didn't have such functionality.

Moreover, they require batteries to run, which can only be obtained from that merchant. I wouldn't suggest using them."

"I see…" Rudy took a moment to think and asked, "Have you tried reverse engineering the teleportation device?"

"Yes. No surprises there. It uses a special kind of fuel from the battery. It could be magical energy, or perhaps something we can't imagine."

"Forget about it, then. I can create a portal, but I have to understand the logic behind it. I have a theory, but I need someone to convince me that it could work. Can you tell me how those teleportation devices worked?"

"A simple equation, actually. You need a sender and a receiver. A coordination and a mass value, adding other geometrical formulas." Lu Bela explained in simple words and turned to Rudy with a curious look on her face. "What kind of theory did you have in mind?"

"Simpler than yours."

"Oh? Now I am eager to know."

"You probably know how wireless transfers work, right?"

"So… of course, you need a sender and a receiver at both ends, and you send a file— in this matter, a mass."

"Mine had the same concept."

"Yeah, but mine was simpler."

"How do you propose that into an equation?" Lu Bela inquired.

"That's the tough part. For example, if teleportation through my theory is truly possible, wouldn't it also be possible to apply the same logic to time travel?" He wondered.

"Placing a receiver in the present time, and after a few days, you place a sender?"

"Yes. But then you end up with dead logic. It makes little sense. Because it wouldn't work since both ends exist in the same timeline."

"Yes…"

"For time travel, you would need something like… forth dimension. You have to be out of the bounds of time."

"Are we discussing time travel or teleportation? I am free to give my insights, but you are in a hurry, though."

Rudy released a weary sigh and nodded. "Yes. I got excited for a bit there."

Lu Bela rubbed her chin for a few seconds as she pondered for a solution to Rudy's problem.

"Say, do you have an ability that lets you see the renders of an area, or a spot?"

"Yes. I can see the lines and shapes and stuff. It's like a 3D graph of something before its final proceeding."

"Excellent! Use that ability to collect data from the entry point… sender's end."

"But that's the issue I am facing. In my case, there are two receiver's points and only one sender's point."

"How?"

"I want a teleportal portal, device, a door… whatever— to be used to teleport to the hall of the castle. It's for my moth…" Rudy paused and exhaled. "It's for Rebecca."

He had made a promise that he would stop reffering Rebecca as his mother and call her by name instead.

"Okay, so we have a sender's point, which is your current house, and a receiver's point, which is the castle. That's 1:1. What else do you want?"

"To go back, of course."

"We can simply reverse the formula. That's 1:1, too."

"Here is the twist. I want the portal to work for certain people only. The first portal from my house to the castle should be accessed by all my harem members. But the reverse portal should only be accessed by specific harem members only."

Lu Bela scrunched her nose and made a confused face.

"You can just tell the girls to not use the portal? How is that an issue?"

"Do you really think they would listen to me?" he sighed.

"The portal function you are asking about seems highly improbable. Let us create a normal portal first. We can explore more functions later on."

"Cool."

"So… are we going to do it now?"

"Well, let me try creating a random portal first, aye?"

Lu Bela nodded.

Rudy raised his hands in the air and tried to create a portal. And Lu Bela watched Rudy in excitement.

A few seconds later, Rudy lowered his hands and looked at Lu Bela.

Confused, Lu Bela raised her brow and asked, "Is it a type of portal that only you can see?"

"No. I haven't made one yet. Uhh… how do you make portals? Like, what are the portal's properties?"

"How should I know? I have never seen a portal in my life!"

"Well, I have seen portals. Hmm…" Rudy rubbed his chin as he pondered. "Portals are like a…. a hole in space. A window connecting two different locations through one hole."

"Don't expect me to find logic in that."

Rudy conjured a void ball in his hand and looked at it with amusement.

"Is that a black hole?"

"You may call it a sleeping black hole."

Rudy then created another void ball on the other hand and merged both void balls.

When Lu Bela noticed what Rudy was going to do, she closed her eyes, expecting an explosion, but much to her surprise, nothing happened. Curious, she opened her eyes and saw that the void ball had become larger.

"Huh?"

"It's like adding water to water; they mix. Both void balls had the same properties, so they merged into one. However, if I add value to them— that is, if I input the location value or you may call it coordination — their properties will change and they will not merge.

If they don't merge, they will try to devour each other. That phenomenon is necessary, but it should stop the moment both void balls make contact. Thus, there will be a hole in space connecting two locations.

Now… the question is… how do you stop them from devouring one other?"