Hour of Twilight (instance)

Hour of Twilight is the third and last five player heroic dungeon focused on the final push against Deathwing, released in Patch 4.3.0. It involves escorting Thrall to Wyrmrest Temple in order to put an end to the insane Aspect.

Background
Having shattered the infinite dragonflight and recovered the fabled Dragon Soul, Thrall and his allies must now journey to Wyrmrest Temple and rendezvous with the green, blue, red, and bronze dragonflights. Reaching their destination will be an arduous endeavor: the Twilight's Hammer has amassed its forces near the temple, determined to intercept the Dragon Soul at any cost.

Set in the present-day Dragonblight, now under a full invasion by the Twilight's Hammer. Players must escort Thrall and the Dragon Soul safely to Wyrmrest Temple, where the assault on Deathwing is to commence. But the Twilight's Hammer forces are numerous, and their leadership remains strong. Those attacking the temple are commanded by a man known very well for the strength of will he's offered Alliance citizens. Now with his own will broken, he preaches only Deathwing's cataclysmic vision for all life on Azeroth.

Dungeon Journal
''With the Dragon Soul retrieved from the past, the Heroes of Azeroth now prepare for the final confrontation with Deathwing. In the frozen wastes of Northrend, the towering spire of Wyrmrest Temple is under the assault of Deathwing's Twilight forces. In order to save Azeroth, Thrall must arrive safely at the temple with the Dragon Soul in hand.''

Walkthrough
The party arrives through the timegate in the Crystal Vice, where Thrall awaits them in order to aid him reach Wyrmrest Temple.

The ice elementals under Arcurion will ambush the group, and after the party has dealt with his minions, Arcurion himself appears at the exit from the canyon and joins the fray.

When Arcurion falls, the party heads to Galakrond's Rest digsite. On the other side red drakes await the party in order to transport them to Wyrmrest. On the way the group must deal with the Twilight gauntlet, and finally Asira Dawnslayer - the second boss of the instance that kills one of the drakes on her way in.

When Asira is defeated, Thrall resurrects the slain drake and heads towards the temple, which is surrounded by Iso'rath-like maws. More drakes arrive to take players there as well. After defeating the faceless ones surfacing from the Maw of Destruction, Archbishop Benedictus arrives and leads the party inside Wyrmrest Temple to the Chamber of Aspects.

Benedictus ultimately reveals the fact, that he is just another agent of Deathwing and after brief conversation the fight commences. Thrall initially aids the party, but later is entrapped by Benedictus' shadow powers. The party eventually comes out victorious and preparations for the final strike against the Worldbreaker and the remnants of Twilight forces begin.

Quests

 * The Hour of Twilight
 * To Wyrmrest!
 * The Twilight Prophet (quest)

Achievements

 * Heroic: Hour of Twilight
 * Heroic: Hour of Twilight Guild Run
 * Eclipse (achievement)