End Time

End Time is a heroic-only dungeon found in Caverns of Time, released in Patch 4.3.0 as part of the progression to the fight against Deathwing. This first instance building up to the fight with the Worldbreaker takes adventurers into one of the many possible futures of Azeroth, revealing what will transpire if Deathwing is not stopped: the Hour of Twilight.

Storyline
The Dragon Aspects that occupy Wyrmrest Temple have a problem: They know that if they cannot destroy their fallen brother Deathwing, he'll consume the world. There’s only one artifact with the power to weaken the Black Scourge, but it has long since been destroyed: the Dragon Soul. To retrieve the golden disk the Aspects must charge the heroes of Azeroth with its retrieval from the depths of time. Deathwing first unleashed the power of the Dragon Soul to stop Sargeras and the Burning Legion from entering Azeroth through the Well of Eternity. That means sending players to the Caverns of Time and Nozdormu. Upon arriving, the Aspect of Time will tell them that his ability to send them back to the battle at the Well of Eternity is being interfered with by an entity in the future. First then, players must go forward into the End Time and kill Murozond. Within they'll witness a charred vision of the world should the plan to defeat Deathwing fail.

Description from community site
''One of an infinite number of potential outcomes, this timeway depicts the desolate future of Azeroth should its defenders fail to stop Deathwing. In this bleak future, Nozdormu has identified an anomaly that bars access to both the past and the Dragon Soul: a powerful creature from out of time, living alone amid time-twisted echoes of the past.''

''In order for Nozdormu to provide you the ability to travel back in time to a point before the Dragon Soul was hidden by Malfurion Stormrage from anyone who’d seek its power, you must first go to a distant and desolate future to discover the anomaly blocking the past. You'll find yourself in a very different Dragonblight, stripped of its snowy landscape, with little more than ruins of the once-great dragonshrines. Wyrmrest Temple itself stands only as a reminder of Deathwing's madness—what's left of his scorched remains is impaled atop the structure.

Before you confront the creature disrupting Nozdormu's access to the past, you'll first be called to fight any two of the following four ostensibly familiar leaders, chosen at random each time you play through End Time.

''These long-dead heroes are mere echoes of their former glory, further warped by the corruptive force of time. Their presence here is a great mystery, even to Nozdormu. Once these shades have been laid to rest, the maniacal figure blocking Nozdormu's vision will be revealed at the End Time. None of the Dragon Aspects could have predicted what entity would have such power to interrupt the sight of the Timeless One… the ability to create a new and infinite dragonflight. Only by destroying a mysterious dragon known as Murozond will you give Azeroth's protectors the opportunity to avoid the potential outcome to which your eyes bear witness.''

Dungeon Journal
''One of an infinite number of potential outcomes, this timeway depicts the desolate future of Azeroth should Deathwing fail to be stopped. Nozdormu has identified a powerful anomaly that exists in this moment and bars access to the past - and hope of retrieving the Demon Soul. The powerful creature from out of time live alone amidst the time-twisted echoes of the past.''

Walkthrough
You will encounter three bosses in this dungeon, the first two being randomly selected out of this list of bosses:


 * - Obsidian Dragonshrine
 * - Azure Dragonshrine
 * - Ruby Dragonshrine
 * - Emerald Dragonshrine

The dragonshrines, as well as the starting point are accessed via transportation devices. Nozdormu in his humanoid form can be found hovering near it. After defeating two of fallen heroes, the party faces off  as the final boss in the Bronze Dragonshrine.

Dungeon denizens

 * Black dragonspawn
 * Black drakes
 * Bronze whelp (one, Alurmi)
 * Bronze wyrm (one, Nozdormu)
 * Cockroaches (critters)
 * s
 * Infinite dragonspawn
 * Infinite wyrm (one, Murozond)
 * Geists
 * Ghouls
 * Plague eruptors
 * Sabers
 * Plague eruptors
 * Sabers

Quests

 * The End Time
 * Archival Purposes
 * Murozond (quest)

Achievements

 * Heroic: End Time
 * Heroic: End Time Guild Run
 * Moon Guard (achievement)
 * Severed Ties