''Can you tell me more about Sacred Gear?'' Artoria inquired, rousing Jeanne from her reveries.

''Sure, do you want to hear a summary or in detail?'' Altair, still keeping a smile on his face, asked.

''In detail please.'' Artoria asked politely.

Jeanne was also quite curious to know more about this world.

''The original God of the Bible created Sacred Gear as part of his system to perform miracles on Earth. It was stated that certain individuals with Sacred Gear grew to become very powerful and influential, and that a large number of people who had their names recorded in history were probably possessed of a Sacred Gear.''

Saying this, he realized that he had earned the surprised looks of the two girls.

''So you mean our Noble Phantasm are actually Sacred Gear?'' Artoria asked perplexed.

''No.'' He denied it, and seeing that they still had a confused look on their faces, he continued.

''You are not of this world, so you cannot have Sacred Gear.'' Altair explained calmly to them, earning their nods in confirmation.

He knew that since they were not of this world there wasn't much he could do about it, but he didn't think they would need a Sacred Gear either.

''Moving on... there may be more than one Sacred Gear of the same type. They can range from the common Twice Critical, to the rare Sacred Gear Twilight Healing, with the only exception being the Longinus, which are unique in their own way.'' Altair paused in his speech and quietly waited for them to digest the information he had just given.

Besides, he was in no hurry.

''Longinus?'' Jeanne was puzzled by that term Altair used.

''Yes, besides the normal Sacred Gear, there are the Longinus. The Longinus are first-rate Sacred Gear, each with several abilities compared to a normal Sacred Gear, which has only one, and has the power to kill Gods. This class of Sacred Gear is also known as the God-killing tools.'' He says to the amazement of the two.

''Why would God create something that could kill him?'' Jeanne asked in surprise, since in her opinion it didn't make the slightest sense, unless God didn't want to live anymore, but she doubted that. Besides, she didn't think God would be dumb enough to kill himself.

''That's simple, the Longinus and Balance Breakers were never planned and are glitches in the system. The Longinus class is named for the first Sacred Gear to reach that level of power, the True Longinus.'' After saying that, and getting a confirmation from Jeanne, he went on to say.

''There are 13 Longinus in total. However, there is a possibility for more Sacred Gear to evolve into Longinus, but that depends on the situation they are in.''

The two girls were a little afraid of Altair's statement that new Longinus might emerge. After all, you have to know that Longinus have the power to kill gods, so if Longinus start appearing in masses...

It would be a disaster.

''Indeed, it would be a disaster if that happened.'' As if he had read the girls' minds, Altair said.

"Master, how did you know what we were thinking? Jeanne inquired curiously.

But she soon realized how idiotic her question was, as she remembered that she and her master have a mental connection, which allows them to communicate mentally as well as being able to read some of each other's thoughts and emotions.

Jeanne felt foolish now.

''Master, you mentioned 'Balance Breaker' and 'True Longinus', what are they?'' Artoria asked pulling Jeanne, once again, out of her thoughts.

''Sacred Gears have a final state of activation called Balance Breaker, which is the most powerful manifestation of Sacred Gear.'' He began to speak earning a nod from Artoria in signal to continue.

''Once achieved, Balance Breaker can be inserted again much more easily than the first time. An incomplete Balance Breaker can be achieved by self-sacrifice on the part of the user. However, this method of sacrifice does not count as a true activation of Balance Breaker. Achieving Balance Breaker can be triggered by the feelings of its possessor.'' Altair finished with the two nodding their heads in understanding.

''What about True Longinus?'' Artoria inquired.

''The True Longinus is a Sacred Gear that gave its name to all the others that are capable of killing gods.''

Altair paused a little when he saw that they were paying extreme attention to what he was saying, and with a nod he continued.

''The True Longinus is one of the Holy Relics, known as the Holy Spear, alongside the True Cross, Holy Nails, Shroud of Turin and the Holy Grail.'' That last part was impossible, for the two of them, not to be perplexed.

Standing next to a virtually omnipotent wish-fulfilling artifact.

Just what kind of spear was that?!

''According to my information, it is a spear that would have pierced the side of Christ's body while he was lying on the cross, wielded by a centurion named Longinus, according to legend, who gave the weapon its name. The spear is one of the most sacred objects in existence, having been blessed by the blood of Jesus Christ and making it an extremely powerful and effective weapon against demons and beings related to darkness. This spear, being one of the thirteen Longinus created by God from the Bible, True Longinus is considered one of the biggest "bugs" in the Sacred Gear system, possessing world-class powers that could destroy the world when used in the wrong hands.''

The two girls were startled to hear what Altair said, a power capable of destroying the world was no joke, as it entailed the lives of billions of people.

If this artifact fell into the wrong hands, then it would be the end of everything they knew.

Altair just sat there waiting for Artoria and Jeanne to calm down and digest the information he had given them.

To say that they were not shocked would be a lie, it was too much information for both of them.

''Master, please continue the explanation about Sacred Gear.'' Artoria said after calming down with Jeanne.

Turning his gaze to Jeanne who was also paying attention, Altair decided to continue talking, but not before taking a light sip of the wine that he still found extremely bad but at the same time addictive.

Sacred Gears can have various effects, such as Twilight Healing, which grants almost instantaneous healing, and Twice Critical, which doubles the power of the user. A Sacred Gear called Sword Birth, for example, can create Demonic Swords imbued with different attributes; examples include creating a sword that absorbs sacred energy, a sword that devours flames, and a sword that absorbs wind. They can also adapt and evolve based on the thoughts, needs, and feelings of their users, acquiring abilities or qualities over time. This is the source of Balance Breaker and also the source of transformation into a subspecies.''

''Subspecies?'' Both asked at the same time.

''Subspecies are Sacred Gear that have taken on a unique characteristic due to the thoughts and feelings of the bearer. They are more powerful than the normal form of the same Sacred Gear, and sometimes they also gain a new ability. Sometimes both the Sacred Gear in its normal state and the Balance Breaker will be a subspecies. Other times, however, only the Balance Breaker will be a subspecies. And even Longinus can get a balance of subspecies.'' He explained earning a surprised look from each of them.

These Longinus have no limit, do they?

''Master...'' Jeanne began to be afraid to ask, for she was afraid of the answer she would receive.

''Yes?'' Altair encouraged her with a smile on his face.

''The True Longinus... does it also have a subspecies?'' Jeanne finally asked.

''Yes...'' As he said this, he noticed that the two girls had some sweat on their bodies due to the fact that they were nervous.

True Longinus is more dangerous than they thought.

''This Sacred Gear has no limit, does it?! What a fucking OP.'' Jeanne exclaimed leaving everyone with a drop behind their heads.

This woman really likes to cuss.

Smiling ungraciously Altair asked. ''Now can I continue, or do you want me to stop here?''

"No way, now that you've started you need to finish. Jeanne demanded that he continue after all, she was very entertained with this new knowledge she was getting from Altair.

Altair sighed and decided to ignore the part where Jeanne demanded, he didn't have the head to argue right now.

''So, what do you guys want to know now?'' Altair asked.

Jeanne then raised her hand and asked.

''Master, can everyone in this world have a Sacred Gear?''

''That's a very good question, Jeanne. Only humans or hybrids of humans can be born with Sacred Gears. Angels and demons can obtain them by resurrecting a human or human hybrid as one of their own.'' At this part they finally understood why Sirzechs had come to meet Altair, but that only left room for another question.

''But if only humans or hybrids can obtain one, how does someone who is turned into a devil, for example, get to keep his Sacred Gear?'' Jeanne inquired confused.

''That's a mystery Jeanne, but if I had to say, it's that God never predicted the reincarnation systems of devils and angels.'' That was the answer Altair had come up with in his past life when he watched the anime.

''What about the fallen angels? How do they get Sacred Gear?'' This time it was Artoria who asked.

''The Fallen Angels, created a ceremony to extract and possess the Sacred Gear from the original user.''

The two girls waved their gourds as if they understood what Altair had just said.

''So... what happens if Sacred Gear is taken from its wearer?'' Artoria kept asking, since every time Altair answered her, her doubts increased.

''If a Sacred Gear is removed from its wearer, they will die.'' Altair said calmly, as if this wasn't very important.

The girls didn't seem to care much about it either, since in their opinion if you were captured and had Sacred Gear extracted, you could only blame yourself for being too weak.

''Is it possible for an individual to possess more than one Sacred Gear?'' This time Jeanne asked.

''Yes, I don't know how many, but that they can have more than one, they can.'' Explained Altair with a somewhat unnatural smile, but that went unnoticed by the girls.

With that, I finish my explanation about Sacred Gear. Do you still have other questions? Don't hesitate to ask, I will answer them all. Altair said fondly, while waiting for them to think for a while.

I want a basic explanation of the history of this world. Artoria was the first to ask, and soon received Jeanne's support for this question.

Okay, where should I start? Altair thought for a while, and then began to speak.

''A long time in the past, a holy war took place, where, the three main fractions: Angels, Fallen Angels and Demons were part of it, in this great conflict, there were many deaths, it was really a very bloody battle. However, halfway through it, two dragons appeared; Ddraig and Albion. Both being quite powerful and they were fighting each other for some reason, causing the war to be stopped and the three fractions to unite to defeat them, and that's where the Biblical God comes in.'' From this moment on, Jeanne was paying full attention to the story Altair was telling.

After a battle where millions died on each side, God was left with only one alternative. Seal the dragons in exchange for his life. As he said this, he noticed that both girls' eyes were wide open.

''N- It's not possible, right?'' Jeanne asked trying to deny Altair's story.

''Unfortunately Jeanne, that really happened. The two dragons ended up having their bodies destroyed and sealed in Sacred Gear, Ddraig in Boost Gear, and the Albion in Divine Dividing. With the death of God, the original Luficer, and the leader of the Fallen Angels, all three fractions retreated and to this day are in a state of cold war, where at any moment, a new holy war could break out.''

Jeanne was destroyed inside, and as much as she wished this was a lie, she knew Altair was telling the truth.

God was dead in this world, she won't get over it any time soon. After all, she was a saint herself, who died in the belief that God was alive and protecting living things.

''Please... I want to be alone for a while.'' Having said that, Jeanne headed towards Altair's room with quick steps.

''Artoria... stay with her.'' Altair said closing his eyes and crossing his arms.

He knew Jeanne would be like this, but the sooner she knew the better, so she will have more time to get over it.

''Yes.'' Artoria confirmed Altair's request and went the same way as Jeanne.

After confirming that Artoria was no longer in the room. He opened his eyes, however, they were different, the glow in his eyes were even more intense, as well as being cold as ice.

Using his mana control, he fired a mini laser through his index finger, focusing on a specific point in the room. Thus destroying a scarlet magic circle that was there. The same magic circle as Sirzechs.

A bug. Which Sirzechs had probably placed to discover information about himself. Altair had already noticed this bug the moment it had been placed, but he had decided not to say anything at the time, because he thought it would only lead to a futile discussion.

''I hope Sirzechs will take advantage of what I said.'' Altair finished his thought with a sarcastic smile on his face.

It was obvious, that at this point, Altair had become a bigger threat than Sirzechs could ever imagine.

''You're going to give me a lot of trouble, you know that?'' Altair commented as, from his inventory, he summoned an ornate spear with a dark blue shaft and is longer than ordinary spears. It features gilded metal decorations, in the shapes of arrowheads, that spiral around a double helix pattern. The decorations end at the top of the spear shaft, which features a white circle that is completely empty, and has a cross that fills the circle, but not completely. There is a small silver stub with four protrusions, two on the left and two more on the right. The tip of it is silver, similar to the shaft, and is longer than other types of spear.

That was the Sacred Gear True Longinus.

The Bomb has been armed.

It remains to be seen when it will explode.

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A chapter more focused on the basic explanation of how the DxD world works.