Guide to maximum Combustion on Alysrazor:
The 1st (0:15) and 2nd (1:10) clips are part of the attempt where I parsed 220k dps.
The 3rd clip (1:52) is a previous attempt with a good combust, but we wiped later on.
Secret to getting a big ignite:
Let ignite fall off right before burn phase starts.
Even if you ignore everything else below, just doing this part right will give you a big combustion.
What I've discovered through testing:
If I chain cast thru the entire tornado phase and continue chain casting into the burn phase, it is very difficult to get a big ignite even if all my procs line up and I stack my cooldowns perfectly (i.e. I never see ignite go higher than 125-150k).
If I let ignite fall off before burn phase begins, then stack a FRESH ignite after the boss gains the +50% dmg taken debuff, I can easily get a 300k+ ignite with just 5-6 pyros.
My theory behind this:
If you chain cast the entire time, your ignite never falls off from the time you get Alysra's Razor (+75%crit). And if you roll an "old" ignite into the burn phase, the old ignite is not fully benefitting (if even benefitting at all) from the +50% dmg taken debuff the boss gets during burn phase.
However, if you let the old ignite fall off, and then right after the boss gets +50% dmg taken, you pop all your cooldowns, you will get a new ignite that stacks up really fast.
Basically, the theory is that, it is difficult to build up an old ignite that has been on the boss for a long time. It is much easier to get a large ignite by stacking a FRESH one after burn phase starts.
Ways to let old ignite fall off:
As you notice in the video, I begin casting AB when tornado phase is almost over. This gives the old ignite time to fall off before burn phase starts.
Other spells you can cast include LB, flame orb, frostbolt, etc or anything else that doesn't refresh ignite. AB is prob the best dmg though. But remember, once you start casting pyros in burn phase, you don't want to cast LB again until right before Combustion (same reason why you don't want to use instant pyros in burn phase, more on that below).
Instant pyros are bad for burn phase, so don't pickup HotStreak and ImpHotStreak talents. I tried a "/cancelaura Hot Streak" macro before, but it is very clunky and once your pyros are <1.0sec cast, sometimes the macro doesn't cancel fast enough.
Reason for spec-
Casting a pyro takes about 1sec during burn phase. When you throw out an insta-pyro from a HS proc, it causes a 1sec GCD. Then it takes you another 1sec to cast another pyro afterwards. The GCD from using HS + 1sec hard cast of pyro afterwards is enough time for ignite to tick, which is bad.
Ideally, you want to chain hard-cast pyros so that they are 1sec cast each, which causes a pyro to land every 1sec, therefore, ignite will never tick. Your ignite will stack higher and higher and you "cash-in" with a giant ignite at the end.
Reason for glyphs-
Use Glyph of Living Bomb. Once you have 25stacks of haste buff, you will have btwn 300-350% haste. This makes LB tick 17-18 times in 12sec, and every tick will be a crit. My average LB tick crit was 17411, so each LB will do 17x17411 = 295,987dmg plus the explosion dmg. LB glyph giving 3% more dmg is really good.
Use Glyph of Fireball instead of Glyph of Pyroblast, because by the time you start casting Pyros, you will almost have Alysra's Razor (+75%crit). I cast 337 total pyros (28hit,309crit) and 152 fireballs (91hit,61crit). So it's much more beneficial to get more fireballs to crit during the 1st air phase.
Use Glyph of Molten Armor. Self-explanatory :)
See additional tips here: