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Enter Temple of Veeshan: Halls of the Betrayer at at the West Portal in the Temple of Veeshan.
There is a 365% CC Debuff (Lesser Draconic Affliction) so you will need 465% Crit Chance in order to crit on every attack. This is important, because even the trash mobs have tons of hit-points.
Throughout the zone, you will find groups of two or three Aerakyn. If there is a deacon among them, kill him first! He heals You can also interrupt the deacon or mezz/CC the group as a coercer. Some of the aerakyn taunt, causing you to lose or change targets.
You can fly in the instance, and will be required to use a flying mount of some type to travel to various areas.
Be very cautious about flying into a new room, because there are sharpshooters that will shoot you out of the air and you might fall to your death.
Zone Walkthrough Edit
When you enter, you will be in the Hall of Assessment.
When you reach the area near ( 394, 4, 276 ) /waypoint 394, 4, 276, you will be ambushed by an Aerakyn sharpshot.
Clear the roaming mobs first so that they won't join in on a fight you are having with another mob later.
Be careful where you fight. Some of the mobs have a nasty knock-back and if you fall into the burning liquid below you will die.
Once you have cleared all the mobs in the Hall of Assessment, head north to the Testament of Mettle.
When you enter the room, you will see the message "With Neragul destroyed the barrier on the conduit is removed... Destroy it while you can!"
Proceed north and then curve to the west to the Conduit of Leadership room and kill Neragul, which will remove the barrier on the conduit.
Clear trash around Neragul ( 1248, 34, -531 ) /waypoint 1248, 34, -531 and his linked adds.
Kill the deacon first, he's a healer.
Slay Neragul and his add. Crowd Control works well here as they are linked.
Go to Center of the Chamber of Anti Static ( 957, 41, -248 ) /waypoint 957, 41, -248 and destroy A Draconic Energy Conduit above you.
Return to the Hall of Assessment then head south, flying above the rubble, to the Testament of Might.
Clear the trash in the room and avoid Captain Stinas, who roams the area flying.
Kill Captain Stinas:
During the fight you will see a message Captain Stinas prepares to unleash a devastating slash! and in your chat window you will see Captain Stinas say Feel the slice of my blade, as it cuts you in two!
This is an uninterruptable, range-based AoE, so slow/root him and joust out at least 15m away. Make sure you pull pets and mercs off as well or they are toast.
Head west to the Chamber of Static.
When you enter the room, you will see the message With Stinas destroyed the barrier on the conduit is removed... Destroy it while you can!
Clear the trash and make your way to A Draconic Energy Conduit and destroy it.
After you destroy the conduit, you will see the message ' With both energy conduits now destroyed, the energy field in the center pylon has diminished. You may be able to pass through!
Head back to the Hall of Assessment and go west through the center pylon to the Auditorium of the Cursed.
Stay well away from Grendish the Betrayer while clearing trash. He has a long-range attack, Scorching Repulsion (1.5 million points of damage!).
Kill the flamewing protectors around the center platform.
There are four on each side and they are linked so when you hit one, you get all four. Crowd control or AE works well.
Stay on the red floor just above the center golden floor so you can wedge your back against the sides to prevent knock-back.
Clear the platforms by killing the groups of flamewing protectors and two flamewing eggtenders.
Clear the lower platform to the west and kill the roaming stonewing guardian.
Clear the lower central platform below the two upper platforms in the center. Moving toward the two eggtenders spawns 12 Grendish Icy Breaths.
Once you have cleared the flamewings and the Icy Breaths, Grendish goes away.
Fly through the seemingly closed gate behind where Grendish was sitting to the next room
Kill Welkus, Guardian of Wurms, who is flying around the room:
Unless you have the DPS to burn down Welkus fast, during the fight you will see a message A strange portal appears, then The strange portal has grown in strength!
Eventually, you will see the message ' The strange portal has gathered enough strength to call forth an elemental guardian warning you of an add, An Elemental Guardian.
At intervals another portal will open and eventually spew out another Elemental Guardian.
The portals appear at random locations and by the time you get to a portal it has already grown in strength and is about to spit out a guardian.
If the portal is close behind you, kill it and prevent the Elemental Guardian from spawning.
Depending on gear and healing, some groups are able to completely ignore the Elemental Guardians and just burn the name.
Make your way to the Theater of Stasis to the north.
Destroy the Tear of Veeshan ( 1730, 117, -70 ) /waypoint 1730, 117, -70 if you are on the quest Tears of Veeshan: Falling Tears to complete that portion of the quest.
Fherin has two linked adds, the captured planeshifters. You must pull them at least 20m from Fherin to stop them from healing. Encounter mezz, stun and DOTs work to control them.
Fherin and his adds have a shared hit point pool. Kill the planeshifters first, then Fherin (at this point he should almost be dead anyway).