Health:

• 10 Man:  10M
• 25 Man:  30M

Abilities:

• Summon Nightmare Portal - Nightmare Portals let you phase to alternate version of the room with Valithria and Dream Clouds everywhere in the room, killing one of the clouds will buff anyone within 10 yards of the cloud with Emerald Vigor
• Dreamwalker's Rage - Deals 10000000 Nature damage to all NPCs in the room. This is the spell Valithria casts to end the combat if you manage to bring her back to 100% life.
• Emerald Vigor - Regenerating 200 Mana every 3.0 sec. Increases Damage done by 10%. Increases Healing done by 10%
• Dream Slip - This is the spell used by Valithria to teleport out of the Citadel after you saved her.

Zone Spells:

• Column of Frost - Marks the location under a random player target. After 2 seconds a column of frost errupts from this location, dealing 9425 to 10575 Frost damage to all enemies within 3 yards, knocking them into the air. Instant

Risen Archmage:

• Frostbolt Volley - Inflicts 3770 to 4230 Frost damage to nearby enemies, reducing their movement speed by 50% for 8 sec. Unlimited range. 2 sec cast
• Mana Void - Summons a Mana Void at a random enemies location. This Mana Void burns 1000 mana per second to all enemies within a 6 radius. Lasts 30 seconds. 60 yd range. Instant

Blazing Skeleton:

• Laying Waste - Surrounds the caster in flames for 12 sec, pulsing 5655 to 6345 Fire damage to all enemies every 2.0 sec. Instant 
• Fireball - Inflicts 4713 to 5287 Fire damage to an enemy. Unlimited range. 0.5 sec cast

Suppressor:

• Suppression - Reduces healing received by the target by 10%. Unlimited range. Instant

Blistering Zombie:

• Corrosion - Whenever the caster lands a melee swing, the target takes 2500 Nature damage every 3.0 seconds and their armor is reduced by 10%. This effect can stack up to 5 times. Lasts 6 sec. Unlimited range. Instant
• Acid Burst - The caster explodes, dealing 14138 to 15862 Nature damage instantly and 1000 Nature damage per second to all enemies within 15 yards. Lasts 20 sec. 0.75 sec cast

Gluttoneous Abomination:

• Gut Spray - Deals 3000 Nature damage per second and increases Physical damage taken by 25% for 12 sec. Instant
• Rot Worms - Spawns from dead Gluttonous Abominations, they will melee you for ~10k damage

The Fight:

This is yet another Akama style fight in my eyes, that is, for most of the fight, you'll be dealing with adds.   But here's the twist in this boss, you don't kill her.    Instead, your healers have to heal her up to 100% to beat the encounter.   She'll start off at 50% health.   Healers get to play the "dps hero" and spam away at her.

Of course, adds will come out making it "difficult" for your raid.   They appear to spawn from the gates, on either side of her, split raid accordingly to deal with adds.   The soft enrage for this is that the adds will spawn more frequently as the fight goes on so you'll eventually get overwhelmed.

The vid didn't show this happening cause the guy never went in, but it looks like portals can spawn where you go in, kill some clouds which give you a buff, increasing damage/healing and mana regen.    We probably want to take turns going in, and get them similar to Loatheb spores, or just send the same group in over and over again.   If the same healers are assigned to go in like that, then they can gear for infinite mana and go max Spell Power, since the buff will give all the mana they need. 

The portals seem to work like Yogg ones, that is, 1 person per portal, 6 at a time (appear to be 3 in 10 man).  Inside the portal, you get to fly around like Kael fight.   Look for green clouds to kill to get the buff, and it stacks, so try to get as much as possible.  You'll be kicked out after 15 seconds, the debuff lasts 30 seconds.   Make the most of it.    We'd likely want 2-3 healers in, the rest dps.   Healers coming out of it should make the use of the buff and just spam Valithria with heals.  

There will be random frost spikes targetted on players, just move away from the targetting circle.

As for the adds...

Blazing Skeleton seem to come 3-4 at a time, appear to just start aoe'ing when they appear.  Watch out for their fire shield aoe thing.   Kill these asap cause they can do a fuckton of damage.

Risen Archmages seem to come 1-2 at a time from the gates, damage mostly from frostbolt volley, might be interruptable.  The other thing he does is summons a void zone of sorts that burns your mana, so don't stand in them.    Another source of aoe damage so kill these, mass dispel the slowing effect if that annoys you too much.

Suppressors appear to do nothing but channel into Valithria to suppress heals on her.   They're relatively easy to take out.   Healers should be aware if they're suppressors on her to not waste heals.   Designated 1-2 DPS should be enough to kill them with some maybe splash aoe damage and they can be vocal about when it's good to heal.

Blistering Zombies seem to come 1-2 at time they probably have to be killed fast before the Corrosion stacks.   Either that or have it trade tank.   But it doesn't seem to be too bad unless the tank is tanking everything else at the same time, last 6 seconds.  Maybe it's kitable?   It also explodes, not sure when, maybe keep melee away, or just run away at low hp (0.75 sec ast)

Gluttonous Abomination seems to come 1 at time and probably tanked facing away from the raid due to that spray.  Their corpses also spawn Rot Worms, which seem to hit decently hard, so tanks be aware to pick those up.

That's about it for the fight.   This is a healer fight!   Heal the raid and the boss, all up to you to beat this thing!