The scene opens up to a room in Camelia's estate. The same woman and Lunafreya were sitting in the same room, just hours before the rite.

Camelia: If worse comes to worse, you can threaten the trident into the sea. Then they'll listen. In the meantime, it will be well guarded. Better than the Oracle herself.

Lunafreya: Understood...I shall reclaim it at the alter.

Camelia: Remember: you'll be under imperial watch.

Lunafreya: (nods) Right.

Camelia: (examines nails) Think of it as a necessary evil in order to forge the covenant.

Lunafreya: (bows) I am in your debt.

Camelia: Once it's over, you may go as you please. But you do so without our protection.

Lunafreya: So be it.

Camelia: You had better get going. (stands up and walks to door) Your public is waiting for you.

After she leaves, it was only Lunafreya Nox Fleuret. Seconds later, magitek troopers storm into the room, guns and weapons trained on her.

The Oracle gets up from her chair, moving the gun barrel that was pointed to her face as she starts to move out of the room. The magitek troopers then begin to escort her towards the public.

Outside, many of the residents of Altissia had gathered outside royal palace. All the way in the back was the Sword of the King and his liege.

Prompto: (comms) Noct, Y/N, you guys in position?

Noctis: Yep.

Y/N: Loud and clear.

Gladiolus: (comms) Don't forget the plan.

Noctis: You guys, too.

Y/N: Relax, Gladio. We got this. Just make sure none of the citizens get hurt.

Gladiolus: (comms) Yeah, I hear you.

Ignis: (comms) Of course.

Ending the calls, Noctis and Y/N begin to move through the crowd.

Noctis: (sigh) Talk about a crowd...like the whole city's come to watch.

Y/N: Can't blame 'em. Lady Lunafreya is about to give a big speech.

Everyone then begins to clap as Lunafreya could be seen coming out of the palace doors. Elegantly, she walks up to the podium.

Lunafreya: Dear, friends, I stand before you today with little hope the words I speak...shall reach beyond these walls. For slowly, but surely, the Light fades from our world. And as it does, the shadows shall loom ever longer until all succumbs to the darkness. Darkness that evokes terror, hatred, and sorrow in the hearts of men. The ashes of Lucis...a dream of peace twisted into a nightmare of death and destruction, claiming innumerable lives and leaving myriad souls to suffer.

The scene then changes to a shot of the hidden basement under Caem. Cor sat on the couch as he listened to the broadcast of Lunafreya's speech.

Iris and Talcott could then be seen in Lestallum with other people as they listened to the Oracle's address there on the radio.

Back in Altissia

Noctis: Luna...

Lunafreya: Yet I beg you, do not surrender to despair. Have faith, for our gods watch over us. By their blessings, by the Stars that light the heavens above, our world will be delivered from the perils of the dark. I stand before you here, in Altissia, to call upon Leviathan, Goddess of the Seas, spirit of the deep. By the sacred rite, I will commune with the Hydraean. But first, I offer you my solemn vow. On my honor as Oracle, I will not rest until the darkness is banished from our world and the Light is restored.

Everyone then begins to clap and cheer. Cor in the Caem lifts his head in high spirits. Talcott and Iris in Lestallum look to each other and smile.

Lunafreya: (bows) Bless you all.

Noctis looks on sadly, Lunafreya noticing his gaze. She reassures him by giving him a smile and a nod, causing him to smile and nod as well. Lunafreya then turns around, retreating into the palace once more as she prepares to depart for the alter.

Noctis looks to Y/N, the red haired male giving his liege his most determined look before nodding as well. The two then hear Noctis's phone ring, the prince taking his phone out as he takes the call.

Ignis: (on phone) Noct, the empire's here.

The two look up into the sky and see the imperial dreadnoughts and transports.

Noctis: We can see 'em.

Ignis: (on phone) Drop ships are closing in on the port. You and Y/N look for a vantage point to approach them.

Noctis: Okay. Look after the citizens.

Gladiolus: (on phone) We got 'em covered.

Prompto: (on phone) So...it begins...

Timeskip

The citizens were now being evacuated, Ignis, Prompto, and Gladiolus doing their best to do so.

On the alter, Lunafreya Nox Fleuret, the Oracle, stood there with a trident in hand. She was awaiting for the Leviathan to awaken and appear before her. The rite was beginning as she was singing.

Soon, the Leviathan's voice could be heard, her language unfamiliar.

Leviathan: What fool mortal dares break the slumber of the Tide!?

Lunafreya: It is I, Lunafreya, blood of the Oracle! Goddess of the Seas, I beseech you: enter into this covenant that the King might reclaim the Stone!

A large splash was made as a large, serpent-like creature emerges from the water. It howls as it was now before the Oracle, angered.

Leviathan: This wretched pile of bone and flesh, ignorant of that which governs All, comes to requisition the might of a goddess?

Lunafreya: I do.

With Noctis

Noctis and Y/N were on a vantage point, overlooking the city. Ignis then calls them.

Ignis: (on phone) Noct, Y/N. The Hydraean has awoken.

Noctis: Civilian?

Gladiolus: (on phone) Almost there. We'll join you when we're done.

Ignis: (on phone) The empire has the Hydraean surrounded. Hurry, Noct, Y/N!

Noctis: We're on it!

Gladiolus: (on phone) Then the rite's already begun?

Noctis: Most likely.

Prompto: (on phone) Time to lead the Hydraean a hand.

Y/N: Noct! MTs ahead!

Engaging the two magitek troopers, Noctis summons the Sword of the Wise as he cuts down the first one, Y/N jumping off his back as he eliminates the next one.

Moving forward, they see moving water bullets moving through the area.

Noctis: What's this water...?

Y/N: No time to question. More enemies!

Warp-striking, Noctis gets rid of the nearby gunman. Y/N summons Hagekure, slashing forward as he quickly got behind them, desummoning the katana as he summons his one-handed sword, thrusting it forward.

The last one, Noctis does a link-strike with Y/N, slashing the magitek trooper upward as Y/N came sliding in, tossing up a storm spell up at the foe, eliminating it. They continue to fight their way through the corridor of MTs, Y/N using Flare Blade for area-of-effect damage and Noctis using the Swords of the Wanderer as he cuts them down.

Running out to a balcony, they look up to see the Hydraean was angered even more, imperial transports surrounding it.

Leviathan: What does a lowly, ephemeral speck know of All Creation!?

The Hydraean swung it's head towards Lunafreya, knocking the stone pillars of the alters down as the attack barely missed the top of her head.

Lunafreya: I know what you must know--that the King of Kings is to drive the darkness from our star.

Leviathan, in a fit of rage, launched a hydro-like torpedo at the Oracle, damaging her as it destroys some of the alter. The Oracle starts to cough, water leaving her mouth as she begins to grow weak. But she doesn't falter, using the trident as support, she stands back up.

Leviathan: Blasphemous ingrates, all men, quick to forget the ages their goddess stood watch!

Lunafreya: It is receiving mercy that men offer praise, and in shedding grace that the gods solicit worship.

Leviathan: Yet this profane speck speaks her "King" heresies before a goddess! Insufferable sacrilege!

She lunged forward, the Hydraean consuming the Oracle, presumably killing her. It wasn't until a bright pillar of Light shines where Lunafreya stood.

Lunafreya extended her hand, a blast leaving her palm as the Hydraean was knocked back. The goddess shrieks in anger and pain.

Lunafreya: I vow the King will prove himself worthy!

Leviathan: If not, then the Feeding shall begin, and it shall not end until every last speck is devoured! So let the covenant be forged. Heaven and Earth, High and Deep, Birth and Return...

With Noctis and Y/N

Ignis: (on phone) Noct, Y/N! Prompto is headed your way.

Noctis: But what about you guys!?

Ignis: (on phone) We'll wait below--there's only room for two. Y/N, you'll have to find a way to meet up with Noct.

Y/N: Got it.

Prompto: (on phone) It's fine! Noct, Y/N, jump!

Noctis: What?

Prompto: (on phone) No time for questions!

Y/N: Well, here goes nothin'!

Noctis: Man...

Taking a running start, Noctis and Y/N run forward and leap off the balcony. Prompto soon comes in, riding in on a spear harpoon. Noctis lands on the seat behind Prompto and Y/N is caught by Noctis's hand.

Y/N: Don't you fucking drop me!

Noctis: I'll try!

Holding on, Prompto flies the two towards the alter, Y/N holding onto Noctis's hand and his other onto the spear for dear life.

Noctis: The hell is this?

Prompto: Ha! New ride we borrowed from the Niffs. This'll get us close. Y/N, how's it going back there?

Y/N: (sarcastically) Just fine and dandy back here! Totally not about to fall off and die if Noct lets me go!

Noctis: Serious?

Prompto: Here she comes!

Noctis: I got this.

Summoning his the Sword of the Wise, Noctis blocks any incoming attacks from above while Y/N swung his sword to stop any attack from below.

Prompto: I'll get as close as I can. Then it's up to you.

Noctis: Alright. Won't be long.

The water attack follows the three as flies through the air. It then dives below water, losing the attack as it resumes it's course.

Noctis: Hey, nice job finding this baby.

Prompto: Moment I saw her, I knew we'd go places.

Y/N: Hey, just don't drop me.

Prompto: Not again!

Y/N: Shit.

Noctis: Not making this easy.

Prompto: Noct, hold on tight!

Resummoning their weapons, they brace for the attacks as they parry them, Prompto focusing on getting Noctis to the alter.

One of the attacks knocks Noctis off his balance, causing Y/N to catch the end of the lancer and Noctis to nearly fall off. Prompto sees this and starts to reach out to grab them.

Prompto: Dude! Don't let go!

Noctis: Hey! Heads up!

Noctis is then lifted up, but Y/N is still continuing to hold on at the end. The three of them scream as they miss the mouth of the Leviathan.

Prompto: Noct, can you reach?

Y/N: You guys wanna hurry it up there!? I'm about to fall!

Prompto: Now!

Summoning his sword, he threw it near the Hydraean's eye as he warps. Prompto then helps Y/N onto the lance, but helps Prompto duck to dodge an attack from the Hydranea. Unfortunately, Y/N was caught from it, causing him to plunge into the waters below, Prompto calling out for him.

Noctis continued to hold onto the Leviathan before he recollected himself. The Hydraean begins to speak to him, but like Titan, he couldn't understand her.

Noctis: Leviathan. I need your power!

The Hydraean roars as he flings him off, the prince landing in one of the Altissian streets. Footsteps could be heard as he sees the familiar red haired male running towards him.

Y/N: Noct! Noct, get up! C'mon!

Noctis: Calm down! (grunts) I fell off a giant serpent!

Y/N: Well forgive me for saying this, but we've got to haul ass!

The two look forward to see Leviathan howling with anger, stands and debris being lifted up by her torrents of waves.

Noctis: So the only way you'll help me is if I take you down?

Y/N: (sarcastically) Gee, I wonder why?

Leviathan then starts to crash through the buildings, Y/N and Noctis dodging her as they swung their swords above them to strike her.

Y/N: Your on your own here, bud. Warp to any of the platforms. I'll try to damage her while I work my way around the floating platforms.

Noctis: Got it.

Point-warping to the platforms, Noctis would warp between them as he strikes the Hydraean as she passes by. Y/N does his best to help Noctis, but considering the large gaps of the platforms and he can't warp, he couldn't do much.

As Noctis teleported around, getting a hit in, the Hydraean grew even more frustrated. She then created orbs of water, aiming it towards Noctis and his friend. The orbs strike the platforms they were on, but due to Noctis's warping, he was able to get to another platform safely. Y/N on the other hand was flung out of the battlefield, landing in one of the streets of Altissia.

Y/N's vision begins to fade as he extends his arm out to where Noctis was, his eyes closing slowly.

With Lunafreya

After witnessing Noctis get launched back and now vulnerable, the Oracle attempts to go to him, but she was severely damaged from the Leviathan's attack from earlier. Footsteps could be heard behind her as the familiar man with a trench coat could be seen.

Ardyn: Now, about that ring...on second thought...you let him have it.

Ardyn then kneels down to her level, taking a knife as he plunges it into her stomach. She grits her teeth in pain as she refuses to cry out. 

From the distance, Noctis's eyes go wide as he witnesses the scene unfold.

The Chancellor of Niflheim keeps the knife lodged in her, still holding onto it as she gasps for breath.

Ardyn: And do remind him about the Crystal.

He then takes his knife out of her, the Oracle collapsing. She holds her stomach in pain as she continues to gasp for breath. Ardyn looks to where Noctis is and shouts.

Ardyn: Oh, Prince! Your bride awaits!

Lunafreya: (shallow breathing) I will pass the ring...to the rightful King...

Ardyn then grabs the Oracle's face, Lunafreya grasping his arm. She then casts some of her magic on him.

Lunafreya: When the prophecy is fulfilled, in all thrall to darkness shall know peace.

Ardyn frowns as he smacks her yelping in pain. He stands up and begins walking away. He clenches his fist as an imperial transport shows up in front of him, opening it's gates.

Ardyn: How sweet...but please, Lady Lunafreya, you first.

He boards the transport, it leaving as the Oracle looks to Noctis. Noctis was currently lying on the debris, the Hydraean howling at him. Lunafreya grabs his trident and runs her magic through it. Her power then calls out to the royal tombs that spread across Eos.

The Light shines down on Noctis as he begins to feel the power of his ancestors flow through him. He starts to float into the air, a determined look on his face. Harnessing the power of the Armiger, he stands ready to face Leviathan.

https://youtu.be/vkKX77Bq0x8

(A/N): This boss fight was too epic that I couldn't even write it. So instead, here's a video of it. I don't own it.

As Noctis defeated the Hydraean, it starts to dissolve into water.

Noctis: It's done...

Now exhausted, he starts to float down and he lands next to Lunafreya on the alter. She begins to crawl to him as he landed on to the stone floor of the alter. She cups his face as she runs his magic through him, chanting something.

Lunafreya: Blessed Stars of life and light...

The Hydraean roars as light begins to shine in front of Noctis and Lunafreya.

The Archaean had appeared before the water goddess. Titan lifts his fist up, punching it down as rocks and spikes appear all around them. It then starts to stop as the waters start to calm, Titan disappearing.

In Noctis's Mind

Noctis begins to open his eyes as he was once again a young child. He had awoken in a field of syllesblossoms. He could see the blurry figure of a young Lunafreya in front of him.

Noctis: Luna?

Lunafreya: So, you found your way here.

Noctis: And you found me.

Lunafreya: A chance to see you once more...who would have thought?

Noctis: What do you mean? Why wouldn't you see me?

Lunafreya: (deep breath) Because my prayers have been answered. My calling fulfilled.

Noctis: But...that doesn't have to come between us.

Lunafreya: You are the Once, Noctis. The Stars shine for you now. That which is yours by right shall be restored to you. Do you remember the flowers of Tenebrae? It seems so long ago. You'll find they await you still, blooming from hill to vale.

Noctis: Will you be there?

She doesn't respond, only shaking her head. The wind starts to blow stronger as they appeared older.

Lunafreya: Would that I could join you...but this moment will have to be enough.

Noctis: It's not right...

The world around them begins to crumble, falling into darkness.

Noctis: (begins to cry) All I...all I wanted...was to save you.

Lunafreya: (picks sylleblossom) When the world falls down around you, and hope is lost, when you find yourself alone, amid a lightless place, look to the distance. Know that I am there, and that I watch over you always.

She lets the sylleblossom go as she gives a sad smile to the prince.

Lunafreya: Farewell, dear Noctis.

Noctis refuses as he begins to try and go over to her, frantically swinging his hands in hopes of grabbing her. He didn't want to let her go.

But to no avail, it didn't work. She drifted off slowly. The sylleblossom transforms into the Ring of Lucii, Noctis taking it sadly.

With Y/N, hours after the Leviathan's defeat

Y/N was awoken as someone was shaking him. Waking up, he sees Gladiolus and Prompto before him.

Gladiolus: Get up! Come on, we've got to head to the alter!

Y/N: R-Right!

The three of them take off towards the alter, calling out for Noctis's and Ignis's names. As they drew near the alter, Ravus walks past him. Gladiolus stares at him, Y/N and Prompto looking past him to see Noctis on the ground and Ignis breathing heavily as he lays next to him.

The two run up to him, Prompto going to Noctis and Y/N going to Ignis. Y/N then calls Gladiolus for help, the Shield of the King putting his hand on Ignis's hand, checking for a pulse. Relieved, there was. Ignis's left eye was burned, only muttering something.

Ignis: Please...forgive me...

The three of them look in between them to see the Ring of Lucii lay there.

Noctis had received the blessing of the Hydraean and the Ring of Lucii, but at the cost of his loved one, Lunafreya Nox Fleuret. The Oracle.