Last update 2nd August 2011
Hello and welcome to the 4.2.x Cataclysm raid mechanics thread.
This is the thread for discussing on an encounter by encounter basis what defensive and offensive cooldowns and abilities work and for recommendations around which spec is better for which fights and why. We are interested in knowing that Cloaking can immune from ability X, but we are not interested in how many Ret pala's your 25 man set up includes or how long you spent wiping on Ragnaros HC last night. Those of you who have seen the 4.0.x thread should have a good idea of what is trying to be achieved here.
I will keep this post updated as much as possible and it shouldn't be more than a day or two from something being confirmed as working or not working to it appearing here in this post.
The below is the initial discoveries of posters in this thread. Very little of it could be considered confirmed at this stage, but this should be a good starting point. Thanks to all contributors for their input. If I have misworded or misunderstood (or just missed) anything anyone has said please PM me.
Both Cloak of Shadows and Feint can be used to mitigate Emberflare damage
Deadly brew/crippling poison can slow Spiderlings
Using Blade Flurry on his legs will hit both legs causing him to walk in a straight line
If you have any issues with staying in range during a stomp (say you're at the end of the hit box such that you have more time to avoid Magma Lines), running forwards at the end of a stomp can keep you in range the entire time.
If you're required by your guild to frequently target swap, WP/WP CAN be viable for Combat and Sub. The general rule of thumb is that IP/DP takes roughly 30 seconds to be superior (to WP/WP). Therefore if you end up swapping legs more often than that (improbable but possible), then you should think about using WP/WP.
Feint can be used on concussive stomp
Jumping on Stomp may work - further testing required
Stomp can be Cloaked - both the damage and the knockback.
Alternative strategy to jumping on stomp is to reverse away from him as he casts if timed properly you will remain in range until he casts and then will be just out of range for the stomp and you can resume following him without dropping a swing.
Eruption stacks can be cloaked off.
Killing Spree - Caution recommended as when using KS on the Blazing Talon Initiates, there have been incidents of players being teleported to Alysrazor even when she should be out of range, further reports indicate that a poorly timed KS can get you one-shotted by her cleave
Glyph of Kick - Can help if on interrupting duty for fireblast from Blazing Talon Initiates (inherent risks of using that glyph notwithstanding)
Feint and Cloak of Shadows both work against Firestorm
Can still parry during burnout
As assassination if you are flying it is recommended to drop backstab from your rotation to avoid energy capping as much and max out dps, rupture is still to be used though.
If you stand on the initiates at the edge you can still attack without being hit by Brushfire
Cloak of Shadows works on the tornados and will not remove your stacks of Blazing Power
When Alysrazor re-ignites, if you have maintained Blazing power, you will want to keep both vanish and tricks on the tank to keep from aggroing
Tricks of the Trade should be used on the Hatchling tank to further enhance their 1000% damage buff.
Burnout: feint works on Blazing buffet and Full power. Try to save the last feint so it will cover full power knockback damage. On heroic it is worth throwing up a recuperate just before the burnout ends for added survivability.
Following a tank death, a hatchling can be evasion tanked and the damage buff should help you down it before evasion expires.
Traps can be disarmed, although doing so will stop you dpsing while the trap is disarmed so be careful not to cap energy
Vanish seems currently unable to drop threat on this boss, even being killed and combat ressing does not drop threat, it is not clear if this is intended mechanics or just a bug at this stage.
Cloak can remove the debuff from Immolation Trap, and can prevent it being applied if the timing is correct
Riplimb is slowable as soon as Shannox throws the spear until he returns it to his master he can be slowed by a maximum of 50% and will gradually regain speed back up to 100%
Killing Spree - Can cause problems with spreading torment or placing you closest to the crystals, as always with KS, caution is recommended.
Cloak of shadows will not remove searing seeds but can immune the detonation alternatively feinting 5s before the explosion will reduce your damage
Smoke bomb will not prevent Majordomo Staghelm from leaping at a random ranged player during cat phase.
Feint works on Flame Scythe as does Cloak
Burning Orbs is not cloakable
As combat instead of switching to the add in the cat phase if you keep dpsing the boss with blade flurry up you should hit both and maintain all your pesky buffs (this does require you to move between the boss and the add)
Killing Spree - should be behaving correctly now - unless you try and KS the Magmaw trash, that's bad
Sulfuras smash - both the firewall damage and the debuff can be cloaked
Blade Flurry can still cleave the Sons of Flame while Ragnaros is being targetted.
You can cloak the Blazing Heat debuff on Ragnaros, preventing any fire patches from spawning.
You can Feint Ragnaros' Hand of Ragnaros (the knockback).
You can also Feint Ragnaros' Magma Trap Eruption.
Using Shadowstep on Ragnaros is a bad idea while he is in the lava.
Sons of flame can not be slowed but can be stunned
Cloak and Feint both work on Molten Inferno cloak is able to resist all damage from this while the cloak is active
Smoke bomb does not appear to prevent seeds targeting
Thrown weapon does work against the living meteors
Meteor impact can be cloak-immuned
Molten Inferno adds (Molten Elementals) can be slowed