Leviathan takes offense to being awoken by a mortal , stating that Noctis must earn her power. She attempts to devour Lunafreya who repels her with the Trident of the Oracle. When Leviathan begins to test Noctis, she is attacked by Niflheim forces, and goes on a rampage. At this point all hell breaks loose...
Forceing battles on multiple fronts leaveing Sora , Donald , and Goofy on their own against the might of an imperial fleet. In the meantime Noctis hitches a ride to Leviathan's side on a Niflheim magitek vehicle piloted by Prompto. The imperials under Ravus's command arrive to destroy Leviathan.

Leviathan destroys the imperials while Ardyn makes his way to Lunafreya and stabs her while Noctis is powerless to help her. With her last strength, Lunafreya invokes the souls of past kings to empower Noctis so he can fight Leviathan, as only by defeating her will she accept the covenant. Noctis defeats her with the help of Titan and passes out. A dying Lunafreya crawls over to him and heals him. Noctis meets her in a dream vision where she passes the Ring of the Lucii to him before her spirit departs from the world.

As the city of Altissia is being devastated by the rampaging Leviathan, Ignis worries for the safety of Prince Noctis. Gladiolus, Ignis and Prompto are on evacuation duty, but Ignis becomes separated from the others. He makes his way toward the Altar of the Tidemother being pursued by Brigadier General Caligo Ulldor, and defeats his magitek armor. He teams up with Ravus who has given up his allegiance to the empire, but only teams up with Ignis as a means to get to Lunafreya, emphasizing this doesn't mean he supports Noctis's bid for the throne of the True King.

Once they get to the altar, Ignis finds Lunafreya's dog Pryna dying. Pryna is a Messenger of the gods who delivers a vision of Noctis fulfilling the prophecy of the True King to Ignis, who learns Noctis must die to save the world.

A power greater then even that of the six purifying all by the light of the crystal and the glaives of rulers past , only at the throne can one receive it and only at the cost of a life , his own. The king of kings shall be granted the power to banish the darkness but the blood price must be paid. To cast out the usurper and usher in dawn's light will cost the life of the chosen. Many has sacrificed for the king so the king must sacrifice himself for all. Now enter reflection so the light can shine within...

Ignis wondered what he saw and presses on.

Ignis and Ravus find Noctis unconscious and Lunafreya dying. Ravus flies into a rage, blaming Noctis for his sister's death, but Ignis quells him by getting in the way blocking the attack aimed at Noctis.

" Get out of my way "
" What are you doing ? "
" removing us of this menace "

Ignis then uses force to calm Ravus...
" come to your senses , man ! Noctis is not the one who killed your sister "
" oh yes he is "

The two drew their weapons and crossed swords with each other. Ravus uses his saber , while Ignis fights with his daggers and lances.

" If you kill him , your sister's sacrifice would had been for nothing. We need Noctis alive to save this world "
" what hope is there in a future that my sister will never see ? Step aside now or i will cut my way through "
" Noctis did not choose this path , this is his fate "
" this is a flaw that must be corrected "
" you should know how he feels "
" I feel nothing "

The two continue to fight each other till they are both battered and tired from the duel. Ignis manages to impale Ravus' prosthetic arm with one of his daggers then drops to the floor to catch his breath. Ravus soon stands up and pulls the dagger out before stumbling to his fallen sister.

" I knew you will face your fate without fear , fulfill your destiny without regret. But a part of me always hoped that you will live your life in happiness. You will have been a great bride. Even in death the oracle does not rest , only when its calling is truly finished , and she will raise to that challenge with a smile on her face.
Oh.. Sister don't go. Please don't leave "

Ravus breaks down with tears in his eyes as Ignis turns to Noctis who is still on the ground passed out from his trial with the Tidemother. Ignis bends down to him when Gladiolus approaches a facade when in reality it was Ardyn disguised as Gladiolus. He then looks at the still form in front of him.
" well , well what do we have here. "

Speaking out loud and seeing Ravus slouched over near the water's edge and Noctis on the ground. Ardyn walks up to them and attempts to finish off the two people. His disguise is then broken by Ravus who calls him by Ardyn.
" oh dear was I that transparent "

Magitek soldiers then storm the area forcing the two to the ground. Ardyn then intends to end it all himself that is when Ravus gets up and protects Noctis and Ignis from him. The Ring of the Lucii falls from Noctis's grasp. The ring is the divine heirloom of the Lucian monarchy that only lends its power to the rightful ring bearer. After Ardyn blasts Ravus away with his magic , he asks Ignis to either join him or be killed.

Gritting his teeth Ignis makes his decision " I give up.. "

He knows he cannot defeat Ardyn in his current state but he picks up the Ring of the Lucii regardless and is determined to find out more about the prophesy and the vision he got form the divine messenger. Perhaps by following Ardyn he can find out more.

Sora , Donald , Goofy , Prompto and Gladiolus arrive to find Ravus and Noctis unconscious as well as Ignis missing.