Mustering the Reds

To get down from the platform, use your Augmented Arcane Prison to summon Keristrasza. Talk to her and she will have an option to teleport you down straight to Transitus Shield.

A friend of mine didn't have the prison because we were doing it together and he thought he wouldn't need it. Then we killed Saragosa, and came back down, and he couldn't turn in this quest.

He talked to Raelorasz and he had an option to get the prison back, but despite the NPC saying he was giving it back, he didn't get one. He had to drop this quest and wait about 30 seconds, but eventually Raelorasz gave him the prison back, and he was able to summon Keristrasza and pick this quest up again.

As many people are still fleshing out their WotLK / Northrend content in this starting zone, or even trying to wrangle some [faction=1091] reputation, I felt this mini-guide would be extremely helpful to new and experienced players alike. It should be noted that the majority of these quests count towards Nothing Boring About Borean which also leads one towards [achievement=1360]. =^)

These quest series begin by discovering a [item=35648] (right-click on this item in the player's bags), dropping from one of the [npc=25719]s, which then starts the first quest chain .
*Player note: Do not confuse the [npc=25719]s (humanoids) with [npc=25722]s (which are dragonkin)*

Puzzling... which after turning in to [npc=26117] at the Transitus Shield gives players...

The Cell where you search for two other fragments of an arcane prison ([item=35668] / [item=35669]. Items acquired at this point become [item=35671] upon turn-in.
*Player note: Both items are found only on the two blue dragon micro-bosses ([npc=25716] / [npc=25712]) in the center of the blue round magic circles outside of the [zone=4265] fissures.*

Here it appears this chain ends, but actually continues on in a 2nd chain. If you lose your [item=35671] at any time, speak to [npc=26117] at the Transitus Shield for a free replacement.
*Player note: Just be certain that it wasn't placed in the bank during a side trip, as there aren't any banks within a large portion of this zone (including the Hold). If he doesn't automagically give you the option to replace it, try clicking the "What is the cause of this conflict?" to bring it up.*

Upon right-clicking [item=35671], player then releases [npc=26206] who then begs for assistance to confront [npc=28859] by talking to her once the player is ready for the [zone=4265] raid zone.

Keristrasza allows players to speak to her again to continue the chain.
*Player note: If she somehow gets lost or the player drops the quest, it is best advised to go just outside of the Shield and summon her for each next quest, as other locations sometimes quest error or are incorrect areas.*

Bait and Switch has players collect 10 [item=35685]s (which are the pink crystal plants all over Coldarra) to make bait to beat his blue dragon guardian, [npc=26232] human form / [npc=26231] (dragon non-quest form). Pretty self-explanatory, just turn them in when done, any extras can be safely deleted.

Once collected she calls for Saragosa's End and gives players a [item=35690] with which to bait [npc=26232] and drag back [item=35709] for another quest.
*Player note: When ready, talk to [npc=26206] by using the [item=35671] and she will teleport the player to [npc=26232]'s platform up way above. Use the [item=35690] to summon her and she'll arrive in dragon form then change to human form for the fight. When dead, call [npc=26206] and turn in the quest, accept the next quest and stop talking to her. Speak to her again for a FREE teleport back down to the ground for the next turn-in.*

Mustering the Reds is where she asks players to carry her to [npc=26117] back at Transitus Shield (in the Prison). Turn it in!

[npc=26117] then wants players to start Springing the Trap by using [item=44950] to light a signal fire on some bundles of wood to the northwest of the Nexus at coords 25.5, 22.
*Player note still valid by user beachboy:

1. Open your map. Move your character so that the arrow representing your position is directly above the "N" and to the left of "The" in "The Nexus" on the map. The bundle of wood you have to light is outside, in the snow.
2. Light the bundle of wood using the item provided to you, [item=44950].
3. Take your hands off your keyboard and mouse, sit back, and enjoy the show. After a few minutes of NPC dialog and a scene where you ride a dragon, you should complete the quest. You do not have to do ANYTHING.
4. Turn in the quest at Transitus Shield.*

~Nexus Location Map~

Finally [npc=26117] asks the player to lay to rest the corrupted aspect of the Prisoner of War, [npc=26723], which shows her as insane probably due to being forced to become [npc=28859]'s new consort. Could also explain [item=43665]
*Player note: Players will have to defeat all of the bosses in the [zone=4265] in order to be able to finally release [npc=26723]'s corrupted aspect. Each boss is connected to one of the three click-able spheres to release her ([npc=26731]=[object=188526] / [npc=26763]=[object=188527] / [npc=26794]=[object=188528]). Proven exception is the [npc=27947] and [npc=27949], which are trash bosses that can be skipped, though Heroic replacements [npc=26796] and [npc=26798] have blue gear loot.*

FINAL NOTE: Killing each of the bosses in the [zone=4265] yields MULTI-FACTION REPUTATION! For advice on defeating [npc=26723] then Click Here

ACHIEVEMENTS! All achievements possible through completing the [zone=4265]:

~~~Overall~~~
The Nexus Defeat the bosses in the [zone=4265]
Nothing Boring About Borean Complete 130 Alliance quests in Borean Tundra
Nothing Boring About Borean Complete 150 Horde quests in Borean Tundra
Loremaster of Northrend Loremaster of Northrend (Alliance)
[achievement=1360] Loremaster of Northrend (Horde)

~~~Heroic Mode~~~
Heroic: The Nexus Defeat the bosses in Heroic Difficulty
Heroic: The Nexus Guild Run Herioc Guild Run
Chaos Theory Anomalus extra credit
Split Personality Telestra extra credit
Intense Cold Keristrasza extra credit
<There is no achievement for [npc=26794]>

These achievements do not include those available for exploration, holidays, skills, professions, [zone=4228], [zone=4500], or the quest chain from Dragonblight. All research, testing, cross-research, linkages, and typographical errors are mine. If someone sees any mistakes or patch changes, please reply and I will eventually update it (ratings checked monthly). Thank you! =^)