The Sefiroth's Fractured Barrier

''With the Sefiroth destroyed and its barrier gone, there was nothing to stop the Dark Apostles from pouring into the Inventus. Expeditionary Captain Eve's orders are to prioritize the protection of the people over locating the traitor Nisroch. Move to the lower levels of the Inventus to prevent the Dark Apostles from invading the Inventus's interior.''

The Sefiroth's Fractured Barrier is a main quest in Elyon.

Walkthrough
Talk to the Elite Inventus Trooper and follow him to the bottom of the stairs. He tells you to go to Rhea Este at the top of the stairs. Follow his directions and talk to Rhea. Defend Rhea from the enemies while she conjures a barrier by defeating the Invading Breaker s, Mechanized Warrior s, Deranged Mechanical-Arm Berserker s and Dark Apostle Horde s. Talk to Rhea again once she finishes summoning the barrier who tells you to find Sylas Visen.

Dialogue
Elite Inventus Trooper: [Player name]! Over here! Come this way!

Elite Inventus Trooper: Rhea Este, who's in charge of defense, went to the upper level all by herself! There are too many enemies for her to handle on her own!

Elite Inventus Trooper: Use the stairs on the right to go up! Please help Rhea!

Elite Inventus Trooper: I'll block the back!

Conversation with Rhea Este:

I-is this the end...?

...Oh! You... You're [Player name]! Thank god! I knew you'd come to help! We've got no time to lose, so I'll get right on it!

The enemy attacks are growing ferocious, so a new barrier must be cast. A barrier that's strong enough to evaporate the enemy upon contact. Those Dark Apostles will die like moths drawn to a flame!

Cover me while I conjure the barrier! I'll leave it to you!

Rhea Este: Please, cover me while I conjure the barrier.

Conversation with Rhea Este:

We'll be able to take a load off for a while. Thank you for your help. But... There's no telling how long it will hold. I think we'll have to preemptively try to stop them somehow.

I must go install a barrier on the upper deck. [Player name], I need you to head to the White Citadel. Multiple sightings of Dark Apostles have been reported from there. It's possible that a powerful Dark Apostle is lurking at the White Citadel.

Find Sylas Visen. He's the man in charge of the White Citadel. And make sure to defeat any Dark Apostles you come across along the way!

Objectives

 * Go to the Inventus Elite Trooper guarding the Inventus lower level entrance.
 * Go to the interior of the Inventus.
 * Follow the Inventus Elite Trooper to the Inventus upper level entrance.
 * Go with the [Inventus Elite Trooper].
 * Talk to the Inventus Elite Trooper to confirm Rhea's location.
 * Talk to the [Inventus Elite Trooper].
 * Talk to Rhea Este.
 * Talk to [Rhea Este].
 * Cover Rhea while she conjures the barrier.
 * (0/4) Defeat [Invading Breaker].
 * (0/4) Defeat [Mechanized Warrior].
 * (0/4) Defeat [Invading Breaker].
 * (0/2) Defeat [Deranged Mechanical-Arm Berserker].
 * (0/8) Defeat the [Dark Apostle Horde].
 * Talk to Rhea Este, who just finished conjuring the barrier.
 * Talk to [Rhea Este].