Hey posting here an idea for a dungeon ( tuned for level 85's ). I was inspired by the Spider Kingdom fan made expansion project ( made by Golden Yak ) when i wrote this. I also posted it on EU forums but didn't had too much luck . Anyway, here we go, enjoy!

Spire of Nerub
Lore :

As the aspect of death, Neltharion, rised from the the depths of the elemental plane of Earth, the damages produced by him felt even in the far frozen reaches of Azeroth.
The cataclysm scattered Northrend to its core, awakening an ancient evil, that many of us thought was banished from this world. Yogg-Saron has corrupted Northrend on both of its sides. Nerubians went insane and opened a siege, led by a mysterious mastermind, while the Twilight Cultitst corrupt the upper Northrend.

Deep in the realm of Nerub, a long forgotten nerubian temple serves now as the stronghold of an evil mastermind. The temple is defended by the faceless horrors led by general Faladrax, while the inner temple is being dominated by Lady Shadrax that practice her twisted magic to corrupt the nerubians and rise them as powerful servants of Saron. The mastermind of those is one of Anub’Arak’s advisors in life.
He was chained by the ‘good’ nerubians led by Kilix the Unraveler , who opposed the ways of Anub’Arak. When cataclysm hit Northrend and awakened Yogg-Saron, he drove Anub’Sahdraw insane and freed him from the Kilix's chains.
Now the heroes of this world have to cleanse the Spire of Nerub from the servants of Saron.


General Faladrax
Powerful leader of the faceless horrors that are found in the depths of Nerub.

Abilities:
Will of Saron : When engaged he will gain a buff, Will of Saron, that will increase his damage done by 50%. ( 75% on heroic ) Can be dispelled.
Absolute Darkness : At 60% and 30% he wil cover the room in shadows, leaving only a small circular spot visible. This phase lasts 30 seconds. He will become untargetable and will strike a random player dealing 30% of his/her HP as damage. You will have to use survival cooldowns here and heal through the damage. ( On heroic he will strike the player for 60% of his/her HP and will stun the player for 3 seconds if Will of Saron is active ).
Shadow Grip ( heroic only ) : Faladrax will randomly pull a player outside the visible spot and he/her will be consumed by shadows. If the player will not make it back to the visible spot in time, the shadows will kill him/her. 15 sec CD.
Consuming Shadows ( heroic only ) : Deals 10% of the players HP in damage every 2 seconds.
Achievment : From the shadows I strike : Defeat General Faladrax without allowing him to use Shadow Grip on Heroic difficulty.


Lady Shadrax
Leader of the Twilight Cultists found within the Spire of Nerub.

Abilities:
Shadow Bolt Barrage : Unleash a deadly shadowy attack, dealing 30.000 to 55.000 (Heroic : 60.000-85.000) to the party. Cannot be interrupted. 20 sec. CD.
Empower Nerubian : Lady Shadrax binds a nerbuain to her will. ( binds 3 on heroic : 2 Damage, 1 Healer)
Empowered Nerubian(s) abilities :
Damage : Lay Havoc : The nerubian will become frenzied and begin to attack a random target until its dead.
Healer ( Heroic only ) : Underworld Mending : Heals Lady Shadrax and other nerubians in range. Can be interrupted.
During combat she will continue to cast Shadow Bolt Barrage. After the nerubian(s) are defeated she will enrage, increasing damage done by 25%. Enrage effect can be removed. ( cannot be removed on heroic ).


Anub’Sahdraw

Mastermind of the Spire.

Abilities:
Impaling Strike : Strikes the enemy for 75.000 ( 110.000 + 50% over 5 sec. on heroic ) damage. 10 sec. CD.
Locust Swarm : Unleash a vile locust swarm upon the party. Deals 30.000 ( 45.000 on heroic ) damage every 3 seconds for 12 seconds. Can be interrupted. ( Heals Anub’Sahdraw for the damage dealt if not interrupted. Heroic only ). Used before and after burrow.
Burrow: Anub’Sahdraw burrows underground. This happens at 50%.
Column of Spikes : While burrowed he will strike at a random player position for 100.000 damage. 3 sec. cast. ( on heroic he will instantly kill the player if he fails to move. Still 3 sec. cast.)
After 3 Column of Spikes casts he will emerge, resuming the attacks.
( Heroic only : after he will emerge he will replace Impaling Strike with Shadow Slash )
Blood Frenzy : For every player striked/killed he gains a 5% attack speed and 5% increase in damage dealt. Cannot be dispelled.
Shadow Slash ( Heroic only ): Slash the player for 100% weapon damage, leaving a stacking debuff that will increase damage taken by 5% ( 10% on heroic ). 10 sec. CD
Heroic only : Surge of Darkness: After Anub’Sahdraw emerges he will unleash Surge of Darkness upon the party, leaving them with 25% of their current HP. Cast every 10. seconds. If a player is not healed over 50%, the next Surge of Darkness will instantly kill that player.

Hope you enjoyed
So.. what do you think about this ?
P.S. Sorry for my bad grammar and english.