Alright, I'm gonna continue my analysis now.
- Leviathan appears from a glowing blue, portal-wave thingy behind Dartz, with Timeaus the Knight of Destiny's slash still visisble, despite the duel having ended. Leviathan swallows up Dartz & leaves.
- Leviathan's Moon Level storm occurs, & Yugi, Kaiba & Joey's bubbles fly out from where they're trapped, through the gash. Joey calls out for Mai, Kaiba stays silent, & Yugi calls out for Pegasus, as Pegasus, Mai & others remain there.
- The Legendary Knights are shown, hands out, saying "Chosen duelists, rejoin us!" THEN the gash disappears, as the souls are returned to their owners. Atem is seen holding Yugi's soul, asking "What's this?" The Knights nod, Atem shuts his eyes, & lets Yugi's soul return to his body.
(Atem has Soul Manipulation via being able to hold a soul?)
- As everyone awakes, Yugi is staring at Leviathan's still present blue portal.
- Atlantis rises. Yugi (Not Atem) surmises that Dartz's God must still be alive.
- This is also the time of the moon level storm.
- Some... American military people (I'm unclear who.) report that the Earthquake has caused a tidal wave moving towards the Atlantic Coast, & it will be 200 meters tall, It will reach the East Coast in about 1 hour.
Presumably this is casual as heck, because it happens as a result of Leviathan awakening, & if Leviathan is infinite power, creating an earthquake that causes usch a tidal wave is, comparatively, like, really weak; Why would what is at best, a Tier 6 (Maybe Tier 5; Can earthquakes go that high?) feat be remarkable for a (High) 3-A being?
* After the group ponders how to get to the floating city of Atlantis, Yugi decides to use Dartz's portal. Joey agrees & says he'll go as well. Tea opposes since they just got their souls back, adding "Doma is too much for us to handle!"
Yugi shakes his head & says "Anzu, you know that's not true. Unless we go and fight alongside the Duel Monsters, the God of Orichalcos can't be stopped." Joey agrees, saying he wants to restore Mai & Valon's souls. Kaiba heads for the portal, Mokuba calls for Kaiba, Kaiba tells the others to wait here. Yugi says he'll switch with his other self, but Tea says he's fine as he is, so he doesn't.
* In the... temple of the Orichalcos place, Yugi retrieves the God Cards from in the snake mouths. Atem notes this:
"Their powers have been stolen." Yugi claims "But I'm sure these cards will help us." Atem: "Yeah. Let's hurry, partner!"
Joey: "The Soul cards on the wall are gone. Did that freak eat them all?" Yugi returns Hermos & Critias to Joey & Kaiba. Joey: "This card gives me confidence!" Kaiba: "This card always belonged to me."
- A vision of Dartz's face is projected over the portal he used, as his laughter is heard & he says "Come, chosen duelists!" Yugi: "Dartz!" Joey: "Let's go!" Kaiba: "You don't need to tell me."
- Yugi, Joey & Kaiba are teleported in, their bodies fading in from the top down, over a portal on the floor (Odd, since the one in the duel area was floating on its side to be walked into.) in the floating city of Atlantis, almost as high as the clouds. Seeing a big door with serpentine imagery on it, Yugi asks "Is Dartz there?" ...& switches to Atem. Gee, very considerate of Tea's feelings, Yugi. Atem says "Dartz!"
- Going to a ruined area, under a... gazebo, I think, they find an effigy or likeness of Dartz sitting on a throne, Dartz & said throne both appearing to be some kind of crystal. But when Yugi touches it, there's a crackling sound, & Dartz & his throne disintegrate. Kaiba's line follows, as can be told in the screenshot below:
* "Took you long enough, chosen duelists," says Dartz's voice, as a vision of his face appears in the roof of the gazebo(?) above them. "My god has already resurrected."
Yugi:
"Impossible! The God of Orichalcos can't resurrect without our souls!" Dartz:
"It's true that it hasn't completely revivied, but I can offer my own soul to compensate." Yug:
"What?" The green pillar of light above Atlantis splits into 4, which curve around the continent & curve around its underside, becoming a great pillar, crackling like electricity, which goes to the surface of the ocean, striking it & opening up a whirlpool, which rapidly expands in size. Leviathan's eyes, glowing yellow, appear at the center of the whirlpool, & rise up, as Leviathan surfaces from the water, & flies towards the floating continent of Atlantis.
In about 10 seconds (Video time, by my rough measurement.), Leviathan has reached Atlantis (Which was very near the clouds.) & coiled around the city. Presuming clouds at 1000 KM elevation, this could be a speed feat somewhere in the ball park of Subsonic Speed, but it may need to be calculated. Useful in a series arguably lacking in speed feats, IMHO.
Now facing Leviathan before them, Yugi/Atem, Joey & Kaiba are shocked. Atem says "That's the God of Orichalcos!"
Joey says "It's huge!" & the group notices Dartz, embedded in Leviathan, with just the torso of his now purple body (With that teal hair.) sticking out. He seems to have some kind of... spider web with sticks at his base? Also, his hands are stuck in Leviathan, too.
Atem:
"He sacrificed his own soul!"
"Chosen duelists, no one can stop this god." Dartz says, without moving his mouth. Kaiba:
"Be quiet! You're a shadow of your former self! And I'll be the one to end you, you ugly monster!" Dartz laughs & asks
"Can you?" Leviathan roars, creating ripples in the air, & the duelists have to shield themselves. Joey says
"We'll lose unless we go all out from the start!"
The following events are not part of a duel. They arm their Duel Disks, each glowing as it would during operation in a Duel. They then summon the following monsters, in order, to attack Dartz/Leviathan:
1. Yugi: Dark Magician, Summoned Skull & Kuriboh (?!?!?!?).
2. Joey: Flame Swordsman, Jinzo, Red Eyes Black Dragon.
3. Kaiba: Blue Eyes Ultimate Dragon, Gadget Soldier (The thing he used one time, & just as Tribute fodder for Blue Eyes White Dragon against Ishizu?!) & Vorse Raider.
Yugi: "And...." Kaiba: "Come out, nameless dragons!" (I guess Kaiba doesn't know/believe their connection to the knights???) Joey: "Lend us your power!"
Yugi immediately activates Legend of Heart, saying "Show us your true forms!" (Because who likes dragons, right?)
Joey: "They're the legendary dragons' true forms!"
Yugi: "Monsters! Go!"
Flame Swordsman & Vorse Raider are shown charging, then The Legendary Knights, & Leviathan roars as it is stabbed in the face by the 5.
https://static.wikia.nocookie.net/vsbattles/images/a/aa/VeryHighQualityArt.png (If I could get the image in a higher quality, I would, for better visibility of who's who & stabbing where.)
Dark Magician & Summoned Skull charge their attacks, Gadget Soldier aims its cannon, Blue Eyes Ultimate Dragon's 3 heads charge their attacks, Red Eyes Black Dragon & Jinzo charge their attacks, then....
Yugi:
"Super Conductive Black Magic!" Joey:
"Cyber Energy Black Flare!" Kaiba:
"Ultimate Burst! Fire all rockets!"
Leviathan is hit at multiple points & reels back!
Its body can be seen moving about its coiled grip of the island, as it pulls its head back some from the floating city of Atlantis.
Yugi activates Multiply (Showing the card of course.), declaring "Timeaus absorbs Kuriboh's multiplication & self-destruction effects!" Timeaus:
"Feel my sword! Justice Sword!"
Timeaus swings his sword, shooting a sword beam, causing multiple explosions all over, making Leviathan reel back. A big, white, spherical explosion erupts near Atlantis, nearly as big as the floating city itself. Joey:
"We did it!" Yugi:
"Everyone will be saved!"
& then we see Leviathan's silhouette emerge (Dartz curiously missing.) Kaiba:
"What?" Yugi:
"No way!" Joey:
"You must be joking! Our attacks didn't hurt it at all?"
Leviathan roars, Yugi, Joey & Kaiba shield themselves, their monsters standing before them except for Yugi's. (Yugi why are your monsters such cowards??)
Leviathan begins charing its attack.
Joey:
"Hold up! If we take that attack..."
Yugi tells Timeaus to absorb Big Shield Gardna's effect (Also, lol, what? Big Shield Gardna has no effect other than being immune to Spells that target it alone when face-down & changing to attack position after being attacked while in Defense Position. Also, it's kind of a jobber.) & has Timeaus activate his effect. Timeaus makes a big, rainbow-coloured barrier over Atlantis. Leviathan's beam collides with it, shattering & destroying all the monsters as the energy erupts. Yugi, Joey & Kaiba shield themselves with their arms/Duel Disks & back away & The 3 Legendary Knights descend in front of them, presumably to guard them. After firing its beam, & the barrier gone, Leviathan coils up higher into the sky.
Yugi:
"One blast destroyed our monsters!"
The 3 Legendary Knights are still standing.
Joey:
"Damn! At this rate, we can't win!"
Leviathan roars, Yugi gasps, Joey says
"Here it comes again!" and a big, rainbow-coloured light appears in the sky, prompting everyone, even Leviathan (& back at the entranceway to Dartz's temple, Mokuba, Tea, Tristan (Still carrying Raphael.). notice it.)
Yugi:
"This glow!"
That is a lot of text. I'll hope people go over it, & try to get to going over 183's parts of the monsters vs Leviathan, in the near future. Sorry about all the words.