The being which will be known as the Biblical God later was ignored by the Gods and only found his existence as amusing. As he came from Human thoughts his existence must be unstable, they thought.
That being only kept wandering around with neutrality and just watch the world. What they didn't know, however, is that it's gathering power through belief.
Then one day, it suddenly disappeared. The Gods thought that it cease existing, but what really happened is that it escaped to Dimensional Gap due to its unstable consciousness.
In the first place, Human thoughts and wishes couldn't be all good or bad. Its neutrality is due to the balance of 'black' and 'white'. But that balance was broken when 'white' dominated the 'black' inside it.
The theory is that the 'white' expelled the 'black' from its body and became the Biblical God while the 'black' became the Demon. The Gods are still unaware of this event and kept on playing around the Earth.
Both of the Biblical God and Demon created their own domain in the Dimensional Gap, and that is the birth of Heaven and Underworld.
With the abundance of Spiritual Power, Biblical God and Demon birthed to beings that aligned with them, the Angels and the Devils. Although they can't use it, they both frantically gathered almost all the Spiritual Power to their domains to birth more of their Angels and Devils.
This is when the Gods realized that something is wrong as the abundant Spiritual Power became thin in a very short time while the population of the creatures remains the same. They searched the Dimensional Gap for an answer and they found it.
Two big factions emerged. The Biblical God and Demon already has an army of billions at their disposal.
Seeing an unknown strong force suddenly emerge, most of the Gods attacked them but they lost horribly and half of them were killed. The Angels and Devils aren't strong per se, but they are too many that they can instantly overpower a God.
There are also exceptions among the Angels and Devils, the first children of both Biblical God and Demon. They can match some of the Gods in terms of strength.
On top of that, the Biblical God and Demon became so strong that they can contend against multiple Chief Gods.
It didn't take them too long to give up as they would only destroy both of themselves so they made a pact not to interfere with each other.
With the pact in effect, they continued to boost their faction until one day, the Demon was betrayed by his children and was eaten, gaining his power and will be known as the four original Devil Kings.
On the Biblical God's side, the 'white' inside him wasn't able to expel all of the 'black' which he also passed to his children making them susceptible to corruption. Thus the Fallen Angels were born.
The Biblical God knew that the Devils are strengthening their forces to invade and destroy the whole world so he started working on the thing that gave him power in the first place, Human beliefs.
Spreading his words and virtues, he managed to gather a very large amount of beliefs and he, along with his Angels was empowered. Although some of the Angels were also fell into corruption due to Fallen Angels, increasing their forces too. They also planned to join the war between the Devils and Angels to gain some domination.
Everything is on the verge of erupting when suddenly, the Biblical God felt an intruder from the Dimensional Gap with very large evil intent, an intruder that is as dangerous as both Ophis and Great Red. Those who are strong enough also felt its presence, including Athena herself.
The Gods prepared for war but they wouldn't mind the damage they can cause. Due to his alignment and love for Humans, the Biblical God couldn't let it reach Earth so he left for the Dimensional Gap and meet it with only a handful of Angels on his side. He did this because facing such enemy, coming to fight it without a certain level of strength would only mean death, and with the upcoming war with the Devils and Fallen Angels, he didn't want to expend his forces.
The Biblical God manages to seal the being which is now called the Beast of the End. And soon after he returned, the war started with the Gods only watching from the sidelines wishing for both sides' mutual destruction.
In the end, the Biblical God was victorious killing the four Devil Kings and billions of other Devils. Although they also incurred a large amount of damage that they won't be able to recover for a few millennia. The Fallen Angels' side has the smallest lost, but only compared to the two other sides.
After the war, some of the Gods proposed that they should attack the weaken Three Factions, but most of them disagreed as they are not certain of victory. They also discovered long ago that it's almost impossible to kill the Biblical God due to the nature of his existence.
"And hence, the current state of affairs... I oversimplified the story so just take it with a grain of salt. The real thing is very complicated due to the many schemes and coincidences. There's is also the existence of other beings like dragons, but that how it goes more or less." Athena ended her story.
"That's an amazing story. I do have some questions I want to clarify regarding that, but I wanted to ask first, what does it have to do with Medusa?" Kisuke refilled everyone's tea and take out more plates of snacks which greatly overjoyed the emotionless Ophis.
Athena first looked at Medusa before saying, "Medusa, along with her sisters, were born from Human beliefs."
Kisuke and Yoruichi finally understood where Athena is coming from, "Then..."
"Yes... We don't want another Biblical God or Demon coming into existence."
"They why did she have to through that? Couldn't you just kill her?" Yoruichi asked.
"...We already tried... Multiple times. But they came back soon after each death. And some of the Gods are against killing her, especially Poseidon. It seems that he's quite eager to be in good terms with Medusa and even gifted her that Pegasus." Athena sneered when she uttered Poseidon's name, "His wife also helped me 'taking care' of Medusa."
"Then the fact that the Biblical God is almost impossible to kill came from her and her sisters?"
"Yes..."
"And you said almost... So you found a way?"
"I found it when I secretly inspected her Divine Core. Unlike us, Gods, Medusa, and her sisters' Divine Core are susceptible to corruption.
"The only thing that can cause corruption to their Cores is that set of chains. It's originally intended for confining and punishing Gods by directly damaging their Divine Cores, but we found out that it can corrupt their Cores instead of damaging it. We only have one set of these chains so we choose Medusa to test our theory and also bind her to this land when she revives.
"Corrupting her Core was successful, but only a small part of it. No matter how many times we pushed it, it won't corrupt further so we assumed that this is the chain's limitation.
"Although we still killed her after that to see if there is any difference and indeed, something different happened. It took her much longer to revive. With that, we hypothesized that if we can completely corrupt their Divine Cores, then we will be able to kill her completely.
"But actually doing it is hard, but I still found a way to do it!" There is a bit of pride when Athena said this.
"You cursed her, huh? You shouldn't really be proud of that..." Kisuke interrupted her.
Athena pouted and can't say anything back so she just continued her explanation, "Yes... But it's not exactly a curse as it just disturbs her mind and strengthened her 'non-human' qualities.
"After that, I expelled the sisters to the Shapeless Isle and started a rumor of a monster kidnapping two goddesses. That resulted in Heroes coming after her head."
"Your aim is not for these Heroes to vanquish her, but for her to get addicted to the act of killing? And it's a success, I guess?" Kisuke stirs his tea as he asks.
"Yes... And it's an unexpected fortune for us that Medusa ate her sisters and further corrupted her while also getting rid of the more troublesome sisters. This is only possible since her elder sisters fused their Divine Core with her in an attempt to return Medusa back to normal. But they failed and their Cores got corrupted too.
"Making sure that she's finally corrupted, we sent the Hero that would kill her. Perseus."
"Why didn't you do it yourself?"
"It's because of our own Divinity that might affect the fully corrupted Core and somehow return it to normal. We couldn't take that kind of risk after coming that far, so we sent him along with weapons that could help to kill her."
"And it failed... How?"
Athena gritted her teeth after recalling what happened that time, "It's due to greed. Some Gods proposed that we should take her head as her eyes are really useful if strengthened. With that in mind, I gave Perseus the Kibisis that could contain and preserve the head.
"The Kibisis is another item from the Age of Primordial Gods and has the ability to trap things and reflect the abilities of those inside it. And one of Medusa's abilities is to induce the worst nightmare you could think of.
"Perseus couldn't go against this ability, but using Kibisis, he was able to reflect her ability back to her. In this case, Medusa would see her worst nightmare. I don't know what she experienced after getting hit by her own ability, but the instant that Perseus was about to cut her head, a single part of her Divine Core suddenly got purified. We failed. And when we retrieved that head, her expression is that of extreme sadness while tears are running down on her face"
"So after several millennia, you still kept trying to corrupt her..."
"Yes... Until this happened..." Athena suddenly stood up and seriously said, "I'm telling you, she's too dangerous! You should get rid of her!"
"Dangerous? How? For you guys' position? And what does it have to do with me?" Kisuke sneered at her words. What they want is too obvious. They just don't want anyone threatening their positions.
Athena wanted to say something, but she couldn't deny his words.
Without waiting for her, Kisuke stood up and said, "I'm taking Medusa with me. Just tell those guys that she died. I can also hide her existence, so you don't have to worry about your lie coming to light as it will also be disadvantageous for me."
Kisuke then separated on of the snacks from the table and handed it over to Ophis before cleaning everything up.
"Where are you going?" Athena asks, dumbfounded.
"We're going home~!"
"What? I thought you have more questions?"
"I didn't say anything about asking them now, did I?" Kisuke still has to process everything she said and cross-check it from his own resources. He wouldn't blindly believe her words even though he is holding her life.
"You're leaving just like that?" Athena couldn't figure out his motives. He's currently holding her life and isn't asking for more benefits. She couldn't help but think that there is a trap somewhere.
"Yup~" Kisuke then started setting up simple teleportation magic that would take them outside.
"What about them?" Yoruichi pointed at the unconscious members of the Perseus Clan. There are only ten or so people left alive after the whole ordeal.
"Ah... I almost forgot. Just kill who you think should be killed. You're more proficient in this area than me." Kisuke replied and unhesitatingly ordered.
"Hmm..." Yoruichi took out a kodachi from her own inventory and started beheading, "This one... and this one... I guess I should also include this guy." She killed a total of three people which is Teny, her clocked grotesque manservant and finally the guy wielding a spear, Petter, "Yosh... That should be enough."
"What's going to happen to me?" Athena couldn't care less even if all of them died here and asked Kisuke. Those three who Yoruichi killed have other dealings with other Gods anyway, so she would have killed them even if Kisuke and Yoruichi let them go.
"I'll contact you later. Just do your best to act like normal. Remember, I'm not really your enemy. I'm just doing this for my own safety."
"..." Athena stayed silent after she heard him.
Kisuke started the teleportation magic with him carrying Ophis, still munching on her snacks and Yoruichi carrying Medusa. Before they disappear, however, Kisuke said his final words to Athena, "Oh, and by the way. You can't trust Hades." After saying those, they're teleported out.
Athena furrowed her brows at his words and tried to guess his meaning. She didn't discard Kisuke's words as she also found some suspicious activities from Hades' side, 'Does he knows something?' While thinking of the her next steps, she teleported to Mount Olympus.
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When they reappearing in the center of Aphaia Temple it's already the middle of the night, Kisuke took in a breath of relief, "Finally~! We can go home! This trip took longer than expected, but the harvest is worth it~!"
Kisuke then started working on the teleportation circle that would take them home. Kisuke's and Yoruichi's Gigai could take care of the formalities of boarding the plane and going home. But before he could even finish the circle, his communication token suddenly rang. He scanned it for a bit to see who the call is coming from. Surprisingly, it's Cleria.
"What's up?" Kisuke casually answered.
"Just a few things. When we arrived this morning, your maid received and guided us. But this afternoon, she suddenly ran off due to some emergency and now I'm helping the Sitri Household to maintain the barrier around the Kuoh Academy so that it could hold the fight which is happening right now. The one fighting is the Gremory Household and Sona Sitri who entered after I took care of the barrier. And their opponent is Kokabiel, one of the leaders of the Fallen Angels..."
"What!?" Kisuke was dumbfounded by this news and Yoruichi is the same.
"Currently, there is only one standing defending everyone, a girl with traditional Japanese clothing used for funerals while using a twin sword. But even then, she's only standing barely. At this rate, they'll all be killed within a minute or two."
Without hesitation, Kisuke took out a token and crushed it. They then all disappeared from their position.