3rd Person Pov

The following night, while preparing dinner, Y/N walks out to see Quetzalcoatl outside the house

You: Is there something wrong?

Quetzalcoatl: I was an enemy of Uruk, no? I don't want to make then uneasy, so is it okay if I stay here? As you know about Tiamat's true form.

You: Then the fact that Gorgon wasn't Tiamat, you didn't know?

Quetzalcoatl: No, I knew. But I was a bad goddess, so I couldn't tell the truth, no. I didn't want you to pity her. But you found me anyways

You: I guess. Come in. There is something that I need to do

Y/N then gets up and teleports away, not far from Uruk, but on the wall where Enkidu was

You: So this where you are, Kingu

Kingu: You!

You: A living corpse like you shouldn't even be here. Gilgamesh knows that you are here too, get lost and if you do, I don't need to kill you

Kingu: ...

You: What's wrong? Afraid of the Reincarnation of Tiamat's son? Weren't you supposed to be the Gods' greatest creation?

Kingu: What gives you-

As Kingu tried to get up, her leg gets chopped off, so Y/N opens his pocket dimension to give the grail to Kingu which healed her wounds

Kingu: What is the meaning of this! I am not Enkidu! I'm... not Enkidu!

You: Correct, you're still using her body. However, King Gilgamesh still wants you alive, you are worthy of her friendship and protection. Besides, you can still be of use to us. I don't care what you do, do as you wish

Enkidu: But-

You: Doesn't matter. In the end, you're still going to die anyways.

Time skip

That morning, they discussed on some of Tiamat's feats. She can't walk on her legs, so the black mud is her only way of transportation . With that being said, she had 8 hours before she arrives at Uruk, meaning less than half a day.

Quetzalcoatl says that her Noble Phantasm can stop the mud for a while, the sun stone that is. With that said, the risk was that staying close to Tiamat will provide magic energy while holding the Lahmu back.

With that being said, Y/N agrees to this plan. Like the previous adventures, Y/N knew that they were just servants, they can be summoned in any day, any time, as long as their catalysts were correct.

You: Mashu, let's make this succeed! (I know that you are here within this crowd, Enkidu)

Time skip

Quetzalcoatl leads the others towards the Sun Tower while they also take care of flying Lahmu and once again, shadow Ushiwakamaru

You: Siegfried, combining with Platinum Ezel! Stay away from my Kouhai!

Y/N slashes Ushiwakamru with his blade claw before she was pushed back down by someone else who everyone thought they would never see

You: Benkei!

Benkei: Allow me to take some responsibility, milord!

You: Glad you came to the party! Those who cannot fly, do not worry about falling, just fight! Platinum Spirit Balmung!

Using the power of servants, Balmung was more powerful as it blasts through multiple Lahmu as Quetzalcoatl and Benkei head towards the Sun stone.

Benkei stops Ushiwakamru while Y/N stops the Lahmu from getting close to Quetzalcoatl

You: I won't allow you to interrupt!!

Once activated, Y/N retreats as he salutes Benkei and Ushiwakamru as the mud burns way, meaning that Tiamat is immobile while Quetzalcoatl continues the attack.

They all thought it was good to stall since the mud was burning, however, Tiamat's horns had a rear skeleton where they lifted her weight, meaning she can fly.

You: So even though the mud has stopped...

Quetzalcoatl: Don't give up hope just yet! I am the divinity of a distant mystic land! The Primordial God of Mesopotamia, you are nothing to me!! Witness the power of our underworld, Xibalba and the cataclysm impact that annihilated countless lives!! I shall burn everyone away, Ultimo Tope Patada!

Quetzalcoatl burns in the air as she starts to break, but it wasn't enough

You: By my command seal, Quetzalcoatl, bring victory!! FINISH IT, Quetzalcoatl!!!

The shield then breaks as Quetzalcoatl delivers the blow to Tiamat's horns. She was still alive regardless, but her horns though weren't left alone. Damaged, but not removed

You: I've done Slifer before, I will do it again, all 3 of them!!

Mash: But Y/N, your mana-

You: It'll be okay! Besides, I have enough mana to summon a whole army if I wish! Tiamat, I will stop you whether you like it or not!!

Y/N jumps down from the wyverns as his command seal activates

You: I offer the Souls of Benkei, Ushiwakamaru, and Leonidas, to summon the Gods' Anger!! Raging Thunder from above, send your anger to stop the Primordial God of Mesopotamia! Osiris, the Heavenly Dragon (Slifer)!! Fate belongs in your hands, support us with your power of your might! Come to us now, Obelisk the Tormentor!! Oh precious Sun God, help me win thy fight!! With the final soul of Leonidas, the Legend of Sparta, I offer him to you, the Third God, Ra, the Winged Sun Dragon of Ra!!

Thunder, Fire, and the Ground then begin to roar as 3 gods begin to descend on the lands of Mesopotamia

You: GOD HAND CRUSHER, BLAZE CANNON, AND THUNDERFORCE ATTACK!! Stop my foe in her tracks!!

As they went for the attack, snakes then appear from the water as another appeared, Gorgon.

You: No way... but how... she's even...

Gorgon then attacks the Lahmu as Y/N was confused. Gorgon said she would smash Tiamat's wings herself. Y/N sees it, she is indeed helping them, but in a way

You: Slifer, Obelisk, Ra, if Gorgon goes down, I entrust you to stop Tiamat for as long as you can!

Y/N and Mashu fly away as Gorgon released her Noble Phantasm to destroy Tiamat's wings.

Gorgon: Y/N... thank you so much for the flowers...

She then disappears as Tiamat was still alive, meaning that Y/N's Egyptian Gods were holding Tiamat back

Mash: What about Obelisk, he can't fight while on the ground!

You: Ra's temperature is like the sun, if not hotter, so the mud will burn regardless! By most, they will stop her for another few hours!

When they arrived back at Uruk, everything was in flames. No survivor in sight.

Gilgamesh; Sit back as I do my work! All 360 Dingirs mounted on Uruk were made by me, so infused with my energy, I will work until my body disintegrates!!

You: Ereshkigal, is it ready yet?!

Ereshkigal; Just a little more, give me a bit more time!!

Just then, something fast approached Y/N, so Gilgamesh stops the blast by pushing him away as she bleeds

You; Gilgamesh!!

Gilgamesh; How dare they try to snipe you while I'm still here? You even have good aim... impressive. Do not worry, I am still fine! Fire!!

You: STOP IT, GILGAMESH!!

Gilgamesh: I can't give up yet! This is not the end of Uruk!! I will not yield when your Egyptian Gods are still fighting over there!! Do you yield, Y/N?!

You: NO!

Gilgamesh: Good, then it's time for me to get serious! I'm going to go all out!

Another round of Lahum attacks as Ishtar and Y/N fight back as Chains then attack the Lahum

You: Enkidu!

Enkidu: Sorry I took so long, now mind if I joined?!

You: Be my guest!

Enkidu then uses her chains, showing no mercy to the Lahmu. She knew that everyone can't do much

Enkidu: I haven't sided with humans, I am a new person altogether. However... I don't have anything anymore... I wanted to see Gil... I want to be with Y/N too... I want to show them... but now... I am not Enkidu, I am Kingu. So, I will do one more thing... Y/N, recall your Egyptian Gods before they get into the mud!! Now!!

You: Hai, Enkidu! Come back, my Egyptian Gods!

Enkidu; Farewell, mother... you chose the wrong child, your son is coming for you, so please wait a little longer. This body remembers what it's supposed to do. Kingu, son of Tiamat, will show you the power of the chain of heavens!

As the  Egyptian Gods returned to Y/N, Enlidu flies towards Tiamat ad lighting shines along with a bright green light

Enkidu: Now, I will awaken the breath of the Stars! ENUMA... ELISH!!!

A huge chain then attacks Tiamat as Enkidu was now gone, binding Tiamat together. Only momentary, but it did the trick

You: Enkidu... no, Kingu

Gilgamesh; I sent my friend of twice, the first was mourning, now is different! Her proud valiant figure is burned into my memory! Thank you, Y/N even though in this era, you have worked for me, I had a feeling it would have ended here. You are a foreigner, an element which surpasses all. I am proud to have you here with me! The time has come, I will leave everything to you.

Mashu/You: Hai!

Ereshkigal: Y/N!! The phase transition between underground Uruk and the underworld is done

You; Great timing! Ishtar, we're doing it now! Drop Tiamat into the underworld!!

Ishtar: About time! No mercy this time, Gate open! The future will take care of itself! An Gal Ta Ki Gal Se!

Ishtar fires the arrow at Tiamat Y/N and Mashu brace for impact

You: GILGAMESH!!!

Gilgamesh just smiles as the place turns white as Y/N and Mashu lands safely thanks to Ereshkigal.

You: Thank you, Ereshkigal!

Ereshkigal: Now we are even. Now, behold!

Tiamat screams as she was locked inside Ereshkigal's authority. With that, Tiamat was locked inside as spears form, locking Tiamat inside a bigger and stronger cage before Tiamat covers herself with mud

You: She's mad!

Tomani confirms that she had gone back to even the Jurassic Age.

You: Stay focused on Tiamat, I believe in you!

Romani: She is most likely in her weakest form in the underworld!

A wave of corruption then appears before them as flowers stop it. They were confused, but Y/N knew that it was...

Merlin: I made it in time!

You: Merlin!

Merlin: In the flesh! Great success! Rest assured, I am the real deal, I came from Avalon! I hate sad partings, so I let my spiritual self die so that I can come here

You: You are full of surprises...

Merlin: Praise me all you wish.

The whole place then rumbles as Tiamat reproduces her wings. Y/N no longer can see the beauty of Tiamat, it was one big beast, or what Merlin calls, BEAST II.

Merlin: Y/N, Mashu, your journey in this Singularity must have been the wildest out of the rest, and that beast is the strongest we will ever fight. Two Goddesses tried to ground her, a pitfall into the underworld as Uruk as the bait. The chains, the punishment, and my flowers. We have tried everything, it isn't enough. It wasn't Gilgamesh, nor the Mage King's Holy Grail, it was you who brought her forth. The enemy, a beast. Y/N, you will be the one to summon a Grand Class servant. Now, look up at the sky, Primordial Sea!

They then see the man again, he must be the Grand Class Servant as it changed form once more

You: Gramps!

First Hassan: Did I surprise you, contractor? From the Mountain Abyss, I come, and only death do I bring. I am the Old Man if the Mountain, the First Hassan-i Sabbah!

The two stared each other down before the First Hassan slices the wings of Tiamat off. No, her while body, the concept of death

Romani: Destroy her now!

You; ...

Ishtar: What is it now, Y/N?!

You: Do it.

An all out assault was made as everyone shot their projectiles at the Beast while Y/N stares it down while taking its wings away. As Tiamat takes a good look at Y/N, he hears what Tiamat says

Tiamat: ...My... Child...

Y/N then stops as Tiamat grabs him with her hand

You: Ah!

Merlin: I got you!

Merlin grabs Y/N as more Lahmu attack. This time, they were even faster than before, looking more like a human.

Ishtar and Merlin stop the Lahmu while Ereshkigal, Y/N, and Mashu went to the overworld.

Ereshkigal: How do we stop her?!

A red light shines as Y/N looks at his right hand

You: This is...

Ereshkigal: A beast Command seal!? Then that means you can control the Lahmus!

As for Merlin, he was fighting with a sword, Excalibur. That was no surprise there. The First Hassan then attacks as well to save Ishtar. Even a Divine Class Spirit was no match for the First Hassan

You: She's going to surface! Ereshkigal, I'm counting on you!

Ereshligal then fights one of the Lahmus as Y/N heads towards Tiamat and while doing so, a rain of swords fall

Gilgamesh: Why are you beating around the bush!?

You: Gilgamesh!

Gilgamesh: I won't die that easily! I will help you out. Servant, Archer, Gilgamesh, Queen of Heroes and Wife of Y/N Emiya Von Einzbern! You're making such a racket and no one shall touch my husband!

Merlin: Don't take your eyes off her!

Tiamat seems to do something. No, her eyes were different, she had a reality marble, no, a creation of another universe

You: What?!

Ereshkigal activates her Noble Phantasm as it seemed to stop Tiamat for a while as Y/N uses the rocks to head into Tiamat's circle

You: You covered the rest, now let me do the rest!

Y/N heads inside the bounded field before holding Tiamat's face as Merlin uses Garden of Avalon to support Y/N by moving as Ereshkigal falls

You: Ereshkigal!!

Ereshkigal: I'll be fine... go... I get to die... in a place as beautiful as this...

You: Okay... Tiamat, Tiamat, can you here me?!

Tiamat: ...?...

You: It's me, your son, Cross!

Tiamat: ...Cr...oss?

You: Yes! Let go of your anger and stop this madness!

Lahmu then appear to kill Y/N, but the First Hassan blocks the attack

First Hassan: Don't even think about it. Fufill your duty, Y/N!

You: I worked so hard just to find you, so please return to me!

Tiamat: They took you away from me!!

You: Tiamat... I know, but I'm here now... so please, leave the humans alone...

Tiamat: I have nurtured many a life... many a life loved me... however, my children used me as a ladder... and they head to places far away, I want to love them forever, I want to be at their side forever... With my son and the world... Is my love... mistaken...?

You: I don't know. But, your children and I love you very much... so, let me free you

Tiamat: Please don't leave me behind... love me again, my child...

You: I will... The Heaven and Stars will align themselves, the people, the animals, and every other living organism shall now face a new, a new era where the destruction of Uruk never happened. With the Power and authority of my mother, Tiamat, I bid you...

A purple button appears as Y/N presses it

You: The X Event: Overwrite's Judgement...

Time itself stops as the whole world makes a new turn for the better as a new sun arises. Once it did, Mashu and Y/N held hands as Tiamat was behind Y/N, hugging him tightly.

When they woke up, it was already night time

You: We're alive!

Mashu: Senpai! Looks like we are somewhere near Babylon

Jagaur: Ah, you're finally awake, nya!

You: Jaguar! And... Quetzalcoatl?!

Quetzalcoatl: Hola! It's your reliable big sister, yes!

You: HOW?!

Quetzalcoatl: Ehe. Thanks to your Noble Phantasm, I'm alive again.

You: Why do I feel heavy?

Y/N looks to see Tiamat hugging him

You: T-Tiamat?!?!

Mash: She's here!

Romani: Well, thanks to X Event: Overwrite's Judgement, Tiamat has no hate for humans. So, she's on our side!

Y/N then carries Tiamat on his shoulders as Quetzalcoatl, Jaguar, Y/N, and Jagaur went to the castle towers

Quetzalcoatl: This is as far as we go. It seems my duties as a foreign goddess has come to an end.

You: Then you, Taiga?

Jaguar: Back to the Hall of Heroes for me! Of course, that doesn't give you a free pass to not go back to your timeline, we miss you, you know!!

You: I get it... but I'm glad that we can give you a proper farewell.

Quetzalcoatl: I'm glad as well. From the beginning, you've always meant whatever you said. Does that mean you actually wanted to marry me?~~

You: Maybe~

Quetzalcoatl: My words were no lie. To stop Gorgon to become Tiamat.

You: Hm... I see. You are powerful after all and yet you said you'd take them all on, no matter who. In the end, you really loved humans

Quetzalcoatl: Yes, it was like back then. A human who was strong in his own way. You did not deny my civilisation. I was very happy about that

Just then, bright light appears as they start to go back to the wall of heroes

You: I will see you soon

Quetzalcoatl: Yes, I know that your victory will be with a crowd cheering for you!

They then disappear as Y/N and Mashu head to Uruk or what was left of it. Damaged, no one on sight. Well, maybe when they arrived at their house

Merlin: Welcome back

You: Merlin, Ishtar!

Ishtar: It was obvious that you'd come back. I'm glad that you are

Merlin then went to get some tea while she ignored the fact that she was going to head locked by Quetzalcoatl

You: And who said you will be getting away with it? Surprise Head Lock!

Merlin: Hey! This is not how you treat your Onee-Chan! I literally helped you and this is what I get!!

Romani: You do deserve it after all.

Merlin then serves the tea after a few minutes of headlock.

Ishtar: Now that Tiamat is now in the property of Y/N, seems like she will be going back with you, right?

You: Yes. She loved humans, she doesn't want to be left alone... but... hm... even mothers can be stubborn...

Ishtar will be staying this age of Uruk and will be enjoying the treasures while Merlin will go back to Avalon to watch Y/N's adventure again.

Merlin: Hm... yes, your adventure will end soon, but not now. I would love to see it unfold. So, I wanted to help you again, like old times. Artoria told me this once, but she said that one day, a man who would become her ally in one of the grail wars would she see fit as her king and she will step down as Queen. Hehe, I can see who she was finally talking about. Well, I need to go now...I pray for clear skies at the end...

Merlin then disappears and while on top of the castle, Enkidu and Gilgamesh stood

Enkidu: Not going to say goodbye to Y/N?

Gilgamesh: No, I've done enough for him and myself. A goodbye wouldn't be suited. Instead, I gave him the Gates of Babylon as my gift to him

Enkidu: You really have gotten soft when Y/N met you

Gilgamesh: I am not!

Enkidu: Sure~ Well, if he does summon you or me, I would like to know him better. Not as Kingu, but Enkidu.

Gilgamesh: Good for you. Since I've decided to play with the humans, I guess this means I truly have gotten a little soft

Enkidu: Yes, yes you have. Are the Chains in your gate?

Gilgamesh: Of course. He'll figure that out in due time when he activates the Gates of Babylon

You: Gilgamesh, Enkidu!!

Gilgamesh: There you are. I'm hoping that you can take care of Tiamat from now on

You: ... Yeah. For now, we wait for the call of Romani.

Time skip

The age of humans hasn't ended there and will never be. As the new sun rises, Y/N, Tiamat, Fou, and Mashu were resdy to be sent back

Ishtar: Strange... it's not like the first time we parted..: but I have a feeling we will see each other again

You: Most likely. Gilgamesh?

Gilgamesh: A souvenir from me to you. The grail for Mashu, and the Gate of Babylon for you, Y/N.

You: E-Eh?!? I don't need that!!

Gilgamesh: Your treasure is my own too. I want to ask you something. How was the land of Uruk?

You/Mash: It was fun!

As Y/N and Mashu head away from the land of Gods, Y/N feels like everything was back to the way it was.

Tiamat: Where are we going now, my child?

You: ... Home, Tiamat- No, mother.

Mash; It's still weird that you can understand her

You: It is not!

However, things did not go back and humanity was still in danger. After returning, Chaldea external reactive theory units 7 through 3 have been destroyed and was failing

You: Doctor!

Romani: Sorry to call you, but the day has come.

Olga: As of today, the lives of the staff in Chaldea are in my, Olga Marie Animusphere's hands! We'll head toward Solomon's Singularity! The Final Singularity, The Grand Temple of Time... Solomon!