(Spoiler Alert, but I must warn you it gets dark.)

Contains Aether Angst.

Aether met Lumine who is now Abyss Leader, a Princess after the fight with Dainsleif against Abyss Herald

The Abyss Herald conjures a portal.

Lumine: So we'll meet again. Though we need not rush, brother. I have more than enough time to wait for you

Aether begins to run towards Lumine.

Aether: Lumine!
Lumine: We have always... had enough time

The Abyss Herald and Lumine leave through the portal as Dainsleif dashes into the portal to follow them. Aether reaches the portal, but phases through it as the portal closes behind him. Leaving him in despair. Your only kin leaves once more, this time escorted by an Abyss Herald, while you watch on helplessly. Their voice seems to hang in the air while you just stand there in the empty ruins, lost in your own world.

Paimon: They... left...

But that was the straw that broke his back, in another case. Blood is boiling. Aether clenched his fists while gritting his teeth. Paimon was getting scared and worried.

Paimon: Aether?

As the blue flames appeared as it surrounds him, His anger fuels him as He screamed in rage.

Aether: AHHHHHHHHHHH!

Then the lightning strikes down at Aether as he began to Transform. Making Paimon flying away while screaming. As the Stormterror's Lair collapsed and Call of the Abyss was also collapse, The reptilian size begins to shape and become bigger. Then Seven Archons from every nation felt something that had never been seen before, They looked afar but they couldn't see what was going on, but they felt his rage and his strong immense power.

Zhongli: What is this, feeling, I felt his rage.
Ei: What an immense power. I could feel Aether's rage.
Venti: Aether, he feels angry.
Nahida: What a great power he has. I felt it

Meanwhile, Miko knew what was happening.

Miko: Aether.

Then she went to the commotion in Mondstadt.

Miko: AETHER!!!!!

Miko arrived with Paimon.

Miko: Where is he?!
Paimon: There!

[There should be a GIF or video here. Update the app now to see it.]

(Play the Music)

Then there was smoke then neon blue lights appeared then as the smoke cleared out then Godzilla let out his Roar in Rage.

His transformation is complete. Aether or rather Godzilla is very enraged.

They were shocked by his transformation and Godzilla let out his rage roar, he fired his atomic beam and began to attack all the Treasure Hoarders. They were horrified by what he has become. Godzilla began to walk away from the scene but he was being hit by Ruin Guards he was getting angry as he move his tail to make them fly. More enemies heading their way as he glared at them then he charge at them as he fought against the monsters.

Miko: He has returned.
Paimon: Who? him?
Miko: Yes, that power belongs to Godzilla himself.
Paimon: No, that's impossible.

Lumine along with Dain, and Herald who felt his immense power went to the commotion.

Lumine: Where's Aether? Where's that creature?

She pointed her finger in her direction.

Paimon: That is Aether... But it is now Godzilla.
Lumine: *shocked* What?! How did this happen?
Paimon: After you left, Aether became depressed and later became enraged and transformed into his current form! Look!

Lumine looked at Godzilla attacking the Old Mondstadt setting them on fire. She watched in horror as He extinguished the Mages and Hilichurls. He roars in anger, Meanwhile, Pyro Mage and Hilichurl ran to safety. Meanwhile, the Knights of Favonius went to the commotion.

Jean: Where's Honorary Knight?!
Paimon: He's the Honorary Knight!

They looked at Godzilla walking as he looked for his enemies in Old Mondstadt, He fired his atomic beam and glared at the Electro-Mech and it dashed as Godzilla charged at it and slammed down.

Jean: Was that Aether?
Miko: Yeah, he's got Godzilla' Powers within him with his rage. He transforms into that monster.

They were shocked that they learned Aether is Godzilla. They looked at Godzilla battling the Mech before he throws into the ruined houses. Venti, Zhongli, Ei, and Nahida arrived on the scene, but their eyes widen in surprise at what they have seen.

Venti: Is that...

They nodded in confirmation. Godzilla continues the carnage around Old Mondstadt, Abyss Creatures, and Treasure Hoarders are running for their lives while the unlucky ones were getting crushed by Godzilla's underfoot, burned alive by his atomic beam, or crushed by the rubble / collapsing buildings or trapped. He walked and saw the Fatui Harbingers, He was very angry with his hatred for the Fatui as he growled aggressively and charged at them.

Dottore: Fire!

They fired at him but to no avail, Godzilla still charging.

Arlecchino: Incoming!

Godzilla finally bashed the wall down and fires his atomic breath, creating more explosions, debris flying off as he roar in anger.
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He looked around the ruins of Old Mondstadt that were on fire, he looked as he growled at them with his reptilian eyes, as if they were afraid of him. He turned away and starts walking away from them and the ruins.

Lumine: Wait... Aether.

Then Godzilla looked at Electro Mech before they charged, Godzilla roared as he beats it down and threw it to the side. He fired his atomic beam and the ground explodes, now the Mech was engulfed in flames as he roared in triumph within his rage. He walked away from the scene.

Lumine: No Wait! Please!

But it was too late, he went to the ocean and swam into the depths, but he was never seen again. They looked at the ruins which are still engulfed in flames, and burning buildings, this was the second downfall of Old Mondstadt in History that it repeat itself as it share the same fate as Khaenri'ah.

Abyss Mage: Help us!

Then Lumine and Yelan help them as their friends search for survivors. After a few minutes, they look at the aftermath.

Miko: He turned against us.
Ei: Traveler.
Venti: Aether, he seems unhappy.

Lumine looked in horror as she realized that her actions led him to be driven mad.

Lumine: Oh no, What have I done?

He was never the same Aether again, Aether was once the Traveler and the Hero of the Teyvat, he became nothing more but the God of Destruction himself.

Aether is no more, There was only.....

Godzilla

King of the Monsters

A God of Destruction

And...

A God of all of the Titans

The End