Iskar Nutshell Guide
#1
This is a two-phase encounter in which the two phases alternate back and for the three times.  Phase 1 is always the same, while each instance of Phase 2 has some variations.  There’s a hard enrage timer or 8 minutes.  

The end of Phase One is determined by Iskar’s health.  He goes into Phase Two at 70%, 45%, and 20% health. Phase Two lasts for 40 seconds.  

During Phase One, the raid faces Iskar alone.  During Phase Two, we face a number of adds.  Different adds are added in each phase.

Special Mechanics

The Eye of Anzu.  This is a glowing orb located on the ground in front of the boss.  It can be picked up by getting close to it and right-clicking on it.  If it is not picked up at all it deals increasing raid-wide Fire damage.

While carrying the Eye of Anzu, the raid member gains the ability to overcome a number of the fight mechanics.  They will get an extra action button, and if they target a raid member and press the button, they can pass the Eye of Anzu to that person.  Only one raid member can hold the Eye at a time.  Raid members holding the Eye gain a debuff called Radiance of Anzu.  It deals low fire damage every 2.5 seconds.

The fighting area is a rectangular room with a cliff at the end of the room opposite the door.  We can fall to our deaths off the cliff.


Phase One

Iskar abilities
* Fel Chakram:  targets 3 raid members.  First it hits a ranged, then bounces to a melee, then hits the tank, then returns to the boss.  It deals damage to everyone in its path + moderate AoE around the targeted players.

* Phantasmal Winds:  targets a THIRD of the raid and pushes them toward the cliff.  Raid members can initially run against the winds to avoid being pushed off, but the pushback gets progressively stronger the longer it’s active.  Holding the Eye of Anzu clears the debuff instantly.

* Phantasmal Wounds:  targets a number of raid members with a debuff that deals moderate Shadow damage and applies a DoT until the targeted raid member is healed to 90% of their health, at which point the debut disappears.  Holding the Eye of Anzu clears this debuff instantly too.

* Fel Incineration:  Targets a random raid member with a debuff that causes them to drop a continuous trail of fire on the ground for a few seconds.  Anybody standing in the fire takes heavy fire damage.

Strategy
Tank Iskar in the middle of the room, facing the door.  Melee stand behind him.  Ranged stand in two groups to either side of the door.  Iskar does not require a tank switch.  We will set up 3 raid markers at the far side of the room:  one in the middle of the room, one on the left, and one on the right.

Dealing with Fel Chakram:  The targeted ranged person should run to the marker on their side of the room.  The melee person should run to the marker straight back.  The tank should run to the third marker (whichever side that is).  The chakram will hit these three people while staying clear of the rest of the raid.  Melee, make sure you aren't standing in the chakram's return path.

Dealing with Phantasmal Winds:  Must receive the Eye of Anzu as quickly as possible.  Prioritize tanks if they are affected, followed by healers, then DPS.  Raid members must figure out who to throw the Eye to.  Only a third of the raid is affected.  The addon, Iskar Helper, is good here as it gives you a panel of the entire raid with the affected raid members highlighted with icons.

Dealing with Phantasmal Wounds:  Heal raid members to 90% or receive the Eye of Anzu.  It’s easiest to pass the Eye, so don’t stress too much about healing them to 90%.  Focus on passing the Eye instead.

Dealing with Fel Incineration:  Move out of the raid and place the line of fire in a way that doesn’t obstruct the raid’s movement.  Keep the fire AWAY from the strip of ground between the door and the boss’ spawn location as we’ll be using that in Phase Two.


Phase Two
This phase lasts 40 seconds.  Each occurrence of Phase Two has more adds.

Iskar’s abilities
During Phase Two, Iskar takes to the air and flies above the raid for the whole phase.  Iskar uses only Focused blast during this time.

Focused Blast:  a large laser that is fired from stationary pylons at the far end of the room.  The laser targets the player currently holding the Eye of Anzu.  It deals massive damage which is split between all players standing in its narrow path.

Adds
* Illusionary Outcasts:  spawn in large numbers.  They have no abilities and just melee the tank.

* Corrupted Talonpriest:  These guys cast Phantasmal Obliteration, a bomb attack.  Basically it marks several raid members with Phantasmal Fel Bomb, and debuffs one raid member with Fel Bomb.  
* Phantasmal Fel Bomb is a debuff that deals heavy Fire damage to everyone within 15 yards of the affected player after 5 seconds.
 * Fel Bomb is a debuff that does nothing on its own.  When it is dispelled, though, all Phantasmal Fel Bombs in the raid are ALSO dispelled, and do not carry out their damaging effect when they otherwise expire.  Fel Bomb can only be dispelled by someone holding the Eye of Anzu.

* Shadowfel Warden (these start showing up in the second Phase One):  These cast Fel Conduit, which is a long channel that deals heavy Nature Damage to 5 random raid members.  The damage increases by 25% every time a Fel Conduit happens.  This can be interrupted by a player holding the Eye of Anzu.

* Fel Raven (this one spawns only in the third Phase One):  The Fel Raven casts Phantasmal Corruption, which marks its current tank.  After a few seconds, the tank explodes and deals massive Fire Damage to the entire raid and increases everyone’s fire damage taken by 100% for 10 seconds.  If the tank is holing the Eye of Anzu, the tank is not targeted by Phantasmal Corruption at all.

Strategy
The raid should stack up roughly around the middle of the room. It’s important that there is enough space for the raid to be able to form a line in order to split the damage of Focused Blast.  When the raid member holding the Eye of Anzu is targeted by the Focused Blast, they must move toward the middle of the room.  Other raid members must line up in front of, or behind, that player in order to split the damage.  The line players must stand on runs between the door and the cliff.

One tank should pick up all the Illusionary Outcasts, while the other picked up the Corrupted Talonpriest and the other adds (Shadowfel Warden, Fel Raven).

Corrupted Talonpriests are a TOP priority during Phase Two.  In order to deal with their Phantasmal Obliteration (the bomb attack), the Eye of Anzu must be passed to a healer.  That healer must then dispel the Fel Bomb from the targeted player, and all of this must happen within 5 seconds.  This completely clears the Fel Bomb debuff and prevents the bombs from exploding.

Illusionary Outcasts must be tanked.  They have no abilities, and killing them is not a priority.  They should be deal with last, and incidental AoE may get them before that.

Second Phase Two
We’ll need to deal with the above adds, plus the Shadowfel Warden.  Its Fel Conduit must be interrupted as quickly as possible.  Since healers should be using the Eye of Anzu in Phase Two anyway, to dispel the Fel Bombs, it’s possible for them to interrupt the Fel Conduit casts as well in some cases (Disc priests, holy paladins, mist weaver monks).  If we have such healers, they should pass the Eye among themselves.  Otherwise, DPS players or tanks will have to momentarily receive the Eye to interrupt Fel Conduit.

Third Phase Two
We’ll need to deal with all of the above adds, plus the Fel Raven.  To handle Phantasmal Corruption, the exploding-tank ability, the Eye of Anzu should be passed to the Fel Raven’s current tank when it is about to be cast.  This makes them completely immune to the debuff and negates the ability.  We can see when it’s going to be cast on our boss mod timers.  If the tank acquires the debuff anyway, the Eye of Anzu can still be thrown to the tank to clear the debuff.  This must be done within a few seconds, though, as otherwise the tank will explode. Tanks can also interrupt the Shadowfel Warden while holding the Eye, if necessary.


ALTERNATIVE STRATEGY for the Third Phase Two:  Have the Raven's tank hold the Eye of Anzu for the entire phase.  The tank will need to interrupt the Warden's channeled cast.  The raid will kill the Raven first.  If we do this strategy, we'll use Bloodlust here to get the Fel Raven down fast.  Once the Raven is dead the tank passes the Eye to a Healer and we proceed as in the second Phase Two, killing the Warden then the Talonpriest.  If the Talonpriest casts Fel Bomb before the Raven is dead, we can either (a) have the tank cast the Eye to a healer for a quick dispel, or (b) have players with bombs move out of the group and eat the damage.


Bloodlust
Strategy 1: We’ll use Bloodlust at the start.
Strategy 2:  We have the Tank hold the Eye during the third Air Phase and we'll blow Bloodlust to kill the Fel Raven fast.
DPS players should use all their personal cooldowns and rings in Phase Two.  Healers should use their legendary rings in Phase Two for Focused Blast, and for potential uninterrupted Fel Conduit damage in the second Phase Two.  Tanks should use their Legendary Rings in Phase Two when damage done to them becomes increasingly hectic.

Learning the Fight
This fight is almost completely about learning how to pass the Eye of Anzu around quickly and accurately.  Many fight mechanics are completely negated by this.  It’s important that all raid members are aware of who is affected by the relevant debuffs by using their raid frames properly.

Summary

Tanks
* During Phase One:  one tank should take Iskar.  The other has no specific task.
* During Phase Two:  One tank should handle the Illusionary Outcasts.  The other tank should handle the other adds.

Healers
* While holding the Eye of Anzu:
— Dispel Fel Bomb
— Interrupt Fel Conduit if your class has an interrupt.

* Beware of very high damage by players struck by Fel Chakram

* Players affected by Phantasmal Wounds can be healed to 90% to remove the debuff.  Do this whenever the Eye of Anzu is not used to remove the debuff.

DPS
* During Phase One:  DPS Shadow-Lord Iskar
* During Phase Two:  DPS the Corrupted Talonpriest as quickly as possible, ideally before Phase Two ends.  The next priority is the Shadowfel Warden (during the second and third Phase Two), and finally the Fel Raven.  Then DPS the other adds as quickly as possible.

Everyone
* Correctly manage the Eye of Anzu
— Pass it to raid members affected by Phantasmal Winds and Phantasmal Wounds
— Pass it to a HEALER during the second Phase Two so they can dispel Fel Conduit and Fel Bombs.
— Pass it to the Fel Raven’s current tank right before it casts Phantasmal Corruption on them.

* Stand in a line in front of or behind the player carrying the Eye of Anzu when Focused Blast is cast, in order to split the damage.

* Run out of the raid and far away when targeted by Fel Chakram.

* Kite the fire trail away from the raid, and from the middle strip of the room, when you have Fel Incineration.
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#2
Okay, so this is a two-phase fight with two alternating phases, Phase One and Phase Two, which alternate three times.  Phase One is always the same, but there will be more adds in successive Phase Twos.  Going into Phase Two is determined by the boss’ health.  He’ll go into Phase Two at 70%, 45%, and 20% health.  Phase Two lasts for 40 seconds.

This fight is all about the EYE OF ANZU.  This is a glowing orb on the ground in front of the boss.  You can pick it up by right-clicking on it.  If it isn’t picked up it’ll deal increasing raid-wide fire damage, so we’ve gotta pick it up.  Only one person can hold the eye at a time.  While carrying the Eye of Anzu, you get the ability to overcome a BUNCH of the fight mechanics.  You’ll get an extra action button, and if you target a raid member and press the button, you can pass the Eye of Anzu to that person, thus removing a bad effect from them.  You can throw the Eye of Anzu, you don't have to be close to the targeted person.  I’ll get more into the Eye in a bit.

During Phase One, we will tank Iskar in the middle of the room, facing the door.  Melee will stand behind him, while ranged stands in two groups to either side of the door.  Iskar is pretty straightforward to tank, and does not require a tank switch.  The second tank doesn’t need to do anything specific during Phase One.

Oscar does FOUR THINGS during Phase One:  he casts FEL CHAKRAM on three people.  This is a projectile attack.  It hits a ranged member first, then a melee, then a tank, then returns to him.. We'll set up three raid markers at the back of the room:  one on the left, one in the middle, and one on the right.  The targeted ranged player must run to the mark on their side.  The melee runs straight back.  The tank runs to the third marker.  Melee, make sure you aren't standing in the return path.

He does PHANTASMAL WINDS.  This targets a THIRD of the raid and pushes them toward the cliff.  You can run against the wind at first, but it gets stronger the longer its active.  Holding the Eye of Anzu clears the debuff instantly.

He does PHANTASMAL WOUNDS:  this applies a DoT until the raid member is healed to 90%, or until they hold the Eye of Anzu.  We will use the Eye of Anzu to clear this debuff as much as possible

Lastly, he does FEL INCINERATION:  This causes you to drop a continuous trail of fire on the ground for a few seconds.  Take this away from the raid and to either side of the room.  Don’t take it down the middle of the room (between the door and the cliff) as we’ll need that space for Phase Two.

SUMMARY OF PHASE ONE:
We’ll tank the boss far away from the cliff, near the door.  The raid will stand behind him.  If you get Fel Chakram, run out, and nobody stand in the arrow.  If you get Fel Incineration, run out and drag the fire to either side of the room, not the middle.

When he casts Phantasmal Winds, pass the Eye of Anzu to affected people to clear it.

When he casts Phantasmal Wounds, pass the Eye of Anzu to those people to clear that.  If we’re having trouble clearing it, heal them to 90%.


PHASE TWO
Phase Two lasts 40 seconds. Iskar will fly up into the air and stay there.  We will stack up roughly around the middle of the room.

He’ll do ONE thing:  he’ll cast FOCUSED BLAST on the person holding the Eye of Anzu.  It is a laser cast from stationary pylons at the far end of the room.  It does massive damage that is SPLIT between everyone standing in a line between the pylons and the person holding the Eye.  It’s important to know it’s a laser and not a projectile, because as a laser it continues past the affected person.

So when he casts FOCUSED BLAST, the person holding the Eye must run to the middle of the room, and raid members must form a line in front of and behind that person to share damage.

Now, for the ADDS.

There will be a bunch of Illusionary Outcasts.  These are really no problem:  they have no abilities and just melee the tank.  We’ll kill them last.  ONE tank should pick them all up, while the OTHER tank handles the other adds.

During the first Phase Two, we’ll have just one more add:  the CORRUPTED TALONPRIEST.  These are a TOP PRIORITY.  They do a nasty BOMB attack.  They cast TWO kinds of bombs:  a Phantasmal Fel Bomb which blows up after 5 seconds, and a Fel Bomb.  The Fel Bomb does nothing on its own, but when it’s dispelled, all the Phantasmal Bombs in the raid are ALSO dispelled and don’t do any damage.  Yay!  But there’s the catch:  the Fel Bomb can only be dispelled by someone who is actually holding the Eye of Anzu.

So, when Phase Two starts, we must pass the Eye of Anzu to a healer.  That healer will then dispel the Fel Bomb.  This all has to happen within five seconds.

SUMMARY OF THE FIRST PHASE TWO:  Okay, so, during the first Phase Two, we need to give the Eye of Anzu to a healer.  The healer must dispel the Fel Bomb.  DPS must kill the Talonpriset.  While this is happening, whoever has the Eye — which will be the healer — will get targeted by a nasty laser at the back of the room.  That person must run to the middle of the room when this happens.  The raid will need to stand in the laser’s line to split the damage and save the person with the Eye.

During the SECOND Phase Two, we’ll have another add to deal with.  This one is the SHADOWFEL WARDEN.  These guys cast Fel Conduit, which is a long channeled spell that deals heavy Nature damage to 5 random raid members.  Damage increases each time it’s cast.  Fel Conduit is interrupted by a player holding the Eye of Anzu.

SUMMARY OF THE SECOND PHASE TWO:  We’ll have to do all the things listed above for the first Phase Two — give the Eye to a healer, protect the healer from the Focused Blast by standing in a line, while the healer dispels Fel Bomb.  That healer must ALSO interrupt Fel Conduit, if they have an interrupt.  If not, they must pass the Eye to a DPS or a Tank to interrupt Fel Conduit, and then the Eye must go right back to a healer.  DPS must kill the Warden, then the Talonpriest (will experiment with this order).

During the THIRD Phase TWO, we’ll have one last add to deal with: the Fel Raven.  This guy casts Phantasmal Corruption on his current tank.  After a few seconds, the tank will explode and deal massive fire damage to the whole raid and apply a debuff.  Nasty stuff.  BUT if the TANK is holding the Eye of Anzu, he won’t get targeted at all.  If he gets the debuff, the Eye will clear it from him.

SUMMARY OF THE THIRD PHASE TWO:  We’ll have to do all the above stuff:  give the Eye to a healer, stand in a line to protect the healer, while the healer dispels the Fel Bomb AND interrupts Fel Conduit or passes the Eye briefly to someone who can interrupt Fel Conduit.  We will also have to pass the Eye to the tank to prevent him from getting Phantasmal Corruption, or to clear it if he gets it.


ALTERNATIVE STRATEGY for the Third Phase Two:  Have the Raven's tank hold the Eye of Anzu for the entire phase.  The tank will need to interrupt the Warden's channeled cast.  The raid will kill the Raven first.  If we do this strategy, we'll use Bloodlust here to get the Fel Raven down fast.  Once the Raven is dead the tank passes the Eye to a Healer and we proceed as in the second Phase Two, killing the Warden then the Talonpriest.  If the Talonpriest casts Fel Bomb before the Raven is dead, we can either (a) have the tank cast the Eye to a healer for a quick dispel, or (b) have players with bombs move out of the group and eat the damage.


The transition from the third air phase to the last ground phase can be tricky.  Focus on getting the adds down first, then Iskar.
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#3
Note:  There is an enormously helpful mod, called Iskar Assist, which I strongly encourage everyone to get.  This mod shows nameplates of the entire raid and which debuffs they have on them.  If you have the Eye of Anzu, this means you can quickly target affected players and pass the Eye to them.

Next, Line of Sight has a very helpful two-minute video on the strategy for the Iskar fight. 
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#4
Awesome video for explaining the fight. Thanks Z.
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