After you and the rest of the thieves used your Personas (or just Myriad Truths the fucker lol) to defeat the holy grail in the center of Mementos, everything falls silent..

Skull: "Hey, we did get 'em, yeah?'

Queen looks to Oracle, her expression questioning and concerned.

Queen: "Oracle?!"

Oracle grunts, looking up at the Holy Grail, her expression covered by her mask.

Oracle: "It's silent...but...i dunno.."

A few seconds pass, before the ground rumbles, the walls lining with a blue aura, before changing into a crimson red color. The thieves exclaim, bunching up together as the ground shakes.

Skull: "What the eff is goin' on?! This looks bad, you guys!"

The roofs of mementos open to what appears to be above the clouds, and the grail unravels, wings appearing from it.

Noir: "Ah...could it be?!"

Fox: "What's going on..!?"

The ground separates, putting the thieves a few hundred miles from the large grail.

Noir: "The Holy Grail in its entirety..."

Panther: "Is this real..?!"

Wings that appear to be made from metal emerge from its sides, golden and silver.

Skull: "Guys, pull it together!"

The grail appears to be a large figure, towering over the thieves at about 2 skyscrapers..

Oracle: "G-Give me a break!"

The large figure, now appearing to be a metallic being, speaks.

???: "I am the administrator born of the collective human conscious. The god of control, Yaldabaoth."

Oracle exclaims.

Oracle: "This is crazy!! It's like a building!"

Panther: "It was already huge back when it was the holy grail!"

Yaldabaoth: "The administrator must guide mankind toward proper development. And now that the foolishness of mankind has been proven, it is the administrator's duty to purge them."

Skull: "You kiddin'!? This is just some kinda rigged game you started!"

Yaldabaoth: "The foolish masses merely spread indolent thoughts and force the progress of society backward. If left to humanity, the world would slowly meet its demise. Rehabilitation is impossible now."

Makoto: "That doesn't mean humans are evil, though!"

Yaldabaoth: "Indeed. There are many upstanding citizens. However, they merely take the sole path before them. The act of making decisions is accompanied by nothing but pain. Even if a cliff to ruin lie ahead, these lemmings would march on without a second thought."

Skull: "Bullshit! You're just forcin' your selfish ideas on people!"

Oracle: "For a god, you're pretty damn prejudiced."

Noir: "If this is all for the sake of humanity, wouldn't being beaten by humans satisfy you?"

Yaldabaoth: "I am the entity which governs this world, its future depends wholly on my leadership. Those who defy this natural order shall be met with punishment raining down from the heavens."

a gust of air pushes through.

Queen: "Ngh..!"

Oracle: "Rgh...that thing's on a totally different level!"

Fox: "Can we defeat something like him?"

Morgana: "This is the best possible outcome! We're fighting against a god whos not holding anything back, right? What bigger target could there be for the phantom thieves to tackle."

Queen: "Although, its still too big for my liking."

Oracle: "I'll give the nav everything I've got!"

Noir: "We can do this if we all work together!"

Panther: "You're right. Let's do this!"

Fox: "Crowning our glory by defeating a god..now that is true art."

Skull: "We just gotta beat that thing, right?!"

Morgana: "Man. You guys are the best, stupidest group I could ask for. Im so glad I was able to be a part of your team."

Joker: "Let's win this."

Morgana: "We'll take it all back..our future...and this world!!"

The final battle starts in the clouds against Yaldabaoth.

Yaldabaoth: "Rebels who dare defy my rule..you shall perish."