I can also confirm that I've had Divine Hymn completely interrupted during Vortex on at least two separate attempts. It's very annoying and it's definitely something that does happen.

I've seen this happen before, but then it was only the Quartz castbar that was buggy, meaning it looked like the cast cancelled, but it really didn't. Haven't had a chance to look at Twins hardmode yet, but I can't really say I noticed anything wrong in the normal version at least. Though I haven't really had to channel many spells in the normal version.

I can confirm this bug. Everytime an orb hits you (regardless whether it has the right color or the wrong color) channeled spells are cancelled. It also happens to mindflay, which is very annoying.

Any sort of threat dump/taunt will work on faction champs. Fade, Shadowmeld if you're a Nelf, soul shatter, feign death, ice block, etc. all work. Taunt, Death grip, Righteous Defense, and Distracting Shot all work as well to peal off any champs that are working you over, although they are subject to diminishing returns.

I can also confirm that getting hit by a ball of any colour seems to interrupt a channeled spell. Definitely a pain, and something I try to time DH or HoH around.

While everyone is prolly in ToC i'm still in ulduar10 completing the last 2 hard modes.
Only yogg and mimiron left and my question for mimiron is for P2.

I fill my role as disc priest and was wondering if a macro like this would be an option?
/tar *name raid member 1*
/cast Power Word: Shield (Rank 14)
/tar *name raid member 2*
/cast Power Word: Shield (Rank 14)
/tar *name raid member 3*
/cast Power Word: Shield (Rank 14)
ect ect. for the rest of the members and spam this once every 10-15 sec

I got my PoM constantly up and when the whole raid is low i shield myselve and use Divine Hymn. With another holy priest and resto druid we got around 11k hps but still keep failing and people die. Is our healing to low or is it people failing with fires?

It honestly sounds much easier to just make a mouseover macro for your PW:S, and fix Grid or whatever you use to see who has Weakened Soul. Been a while since I did this in 10 man, but in 25 man a single priest(even disc) can quite easily keep an entire group up by himself. This might not be as feasible in 10 man since you might only have a single ranged group that will attract a lot of Hand Pulses, but you should try it. Melee obviously has to watch for fire and always stay behind the hands to minimize damage. As long as all healers have range to everyone, I really don't think it should be too hard.

Edit: The enrage timer is much, much more forgiving in 10 man than in 25. Make sure everyone knows this, and that they prioritize survival rather than absolute maximum dps. Also, because of the nicer enrage timer, consider blowing Bloodlust in phase 2. Not only will you get through the phase faster and therefor minimize the gib factor, but it also makes it easier to heal.

I'll go find the mouseover macro in combination with grid changes, didnt think/forgot about that.
for the logs you can check World of Logs - Real Time Raid Analysis

For the last 4 or 5 tries we changed the resto druid to his main spec moonkin and one of the mages log his resto shaman. This setup actually worked better for us and we reached P3 a couple of times.

We found it to be really helpful to split the raid 5/5 in P2. Melee + Paladin or Shaman healer in the middle, and casters + Priest or Druid at range. Any more than 6 or 7 moving around at range, we found that his shooting would just overpower our healing.

I just did firefighter 10m as disc a few days ago. As someone else said, fix grid or your healing addon of preference to show the weakened soul debuff and use clique or a mouseover macro to spam shields on everyone. What we did for P2 is to have me healing the melee, our druid to focus on the ranged players, and the paladin to heal me, the druid and herself. I actually found it relatively easy to keep spamming shields on everyone in the raid not just melee and still keep the melee all healed. I switched out my flash heal glyph for the PoH glyph just because of this phase. We killed it on the 2nd try of the night using that method.

And disc is perfectly capable of healing this. You just need the right idea on how to go about it. Once all of your shields are consumed and everyone has weakened soul if you need to get some quick heals off use borrowed time or put power infusion on yourself so you are casting PoH much faster.

At the start of P3 use Hymn of Hope and Shadowfiend to regen and you are good on mana again (depending on how much PoH spam you did during P2). I don't know if anyone else does this, but I have my Shadowfiend in a macro that casts it on the target of my target. So I just keep healing the tank and hit my macro and my fiend goes for the target of the tank without me ever having to switch targets. Save Divine Hymn for P4. It's very hectic and if fires aren't controlled well you will end up needing it.

During regular mode yesterday, which we finished despite the lag (haha), mind flay ticks didn't get interrupted during vortex/getting hit by balls, which makes me feel hopeful that Hymns will work better now. I didn't get to try it out unfortunately.

Something I found with P2 firefighter that made healing worlds easier was setting up groups ahead of time with at least 1 melee in each. Since POH's range is based off who you cast it on, I would pick 2 people in melee range (one in each group) and target them exclusively. This allows the ranged to spread out in a circle more, and not worry about getting out of range of heals. (Assuming they stay ~30 yards from the boss.) For reference this was 2-healing as disc with a resto druid.

Otherwise as was said above, set up your grid to show weakened soul, roll shields and toss POM.

Points to consider:
1. You have Levitate. Try it out. It's nifty for Gormok.
2. 3 tanks and 6 healers is fairly standard. You can even get away with 7 healers.
3. Running in so melee can assist on Snobolds is fairly common practice, especially since target switching sucks for most ranged classes.
4. Your dps needs to pick it way up. Until you can actually beat the worm spawn, you're not doing it right. Part of that is going to be keeping most of the ranged on the boss, not the snobolds; they can help with incidental AoE, and some target switching as their dps allows.

Have ranged run to melee if they get a snobold. Make sure someone marks them, so that main tank healers have first priority, then ranged. If melee gets one, just let cleave damage do the job. Ranged stay on Gormok at all times(Elemental Shamans can CH, shadow priests can multi-dot). All melee kill snobolds, and cleave the boss. It's perfectly doable with 2 tanks with a proper cooldown rotation, but 3 tanks can make the worms significantly easier.

I hate to say it, but it's definitely your dps. You've got about five people hovering around 6000 dps, and the rest are all well below that. Your hunters and melee should all be screaming dps during this. I looked at the WoL for my heroic kill, and during Gormok there are four at or over 7000 (melee) and six more at or above 6000 (and our guild's strength is *not* its dps). Our Gormok kill was 107k raid dps. Your best attempt was 83k, and that's with Bloodlust. We have the ranged dedicated to snobolds when they are up, and the melee are dedicated to Gormok.

Also, Constantius says you can get away with seven healers, but we did it with five (two holy priests, holy paladin, druid, shaman), and in your case, I'd suggest fewer healers to try and squeeze out even more DPS on the boss. My guild goes short 1-2 healers for most fights because we have incredible healers, but I know that's not true for everyone. If you can pull it off with five healers and add another 5000+ raid dps, you'll be that much closer, but you won't hit the benchmarks without everyone else in your raid pushing their dps a little harder. Might be a gear issue, too, but I didn't check.

Hope this helps, and good luck on your future attempts!

p.s. I wouldn't cheese the encounter and use Levitate. I just found out about it, but my understanding is that it's a bug. I'm surprised people are endorsing "creative use of game mechanics" on these forums, to be honest. It's too easy to move out of the fires. The only time you have a problem is if you get stunned by the snobold the same time a fire patch hits the ground. Earn the victory, don't exploit bugs.

We go 2 tank, 6 heal. (Prot pallies are extremely effective for getting off Impale stacks)

We ignore snobolds on melee, and if any ranged or healers get it, they move to just behind the boss, outside of AOE range. The ranged dps then blow up the snobold. It may take longer, but your melee pretty much just stay on the boss.

your DK and your spriest are crazy low also. If you can not comfortably beat the timer on Gormok you are going to have tons of problems in hard mode. (besides the worm timer and the Icehowl enrage timer, being able to destroy portals on Jaraxxus before a second Mistress comes out will also be a problem)

Endorsing bugs seem to be the only way they ever get fixed anyways. Side note, sure. But personally, I just levitate myself and/or Resto Shamans or Holy Paladins IF they're next to me. I'd say cheesing it is going all-out Levitating every ranged/healer and keeping the levitate up.

We already kill heroic beasts on 1st or 2nd pull but this is kinda new for me. Can you please elaborate on Levitate usage? How does it help?

If Levitate is active when you get hit with a direct Fire Bomb from Gormok, Levitate will be removed but the fire patch won't spawn on the ground under you.

Ouch! Sounds like a bug rather than feature but thanks for explanation.

It gives me something to do in Phase 1, makes the phase easier, and if it's a bug, will be fixed. It doesn't dramatically change the tenor of the fight (esp. since P1 is the easiest part of the fight anyway), and I get bored easily.

A couple of other tips.

We run 2 tanks and 5 healers which works well for us. The trick for the tanks is to use a BoP rotation to get the stacks off.

1. When going into the middle, I assume you don't mean close enough for the staggering stomp. That can kill people and interrupt spell casts.

2. I would suggest to not kill snobolds that are on melee and only kill the ones on range or healers until after gormok is down. I think it varies how you want to handle snobolds, we have ranged kill them and switch back to boss while melee sticks to boss, but you could do the opposite depending on your raid composition.

I need help deciding how my 10 man heroic toc group should heal Anub without a holy paladin to keep both tanks up during the last 30%. If we can get a holy paladin, we will, but for now, this is the group comp:

Holy/Disc priest (me) - I have a very decent shadow set if the other 2 healers would be better together, though
Resto/Enh shaman - very nice enhancement set, but I like ranged dps better for Anub
Moonkin/Resto druid
Fury war
Prot pal
Blood dk (tank)
Frost dk (dps)
Mut rogue
Shadow priest
MM Hunter

As you can see, we are a little short on ranged dps, so it looks like me as disc and the shaman as resto would be the way to go. If it is, how should we go about healing the fight? The tanks both take ridiculous amounts of damage, although maybe having the paladin on the adds freedom kiting them through the permafrost would be a good idea with the DK popping all defensive cds on the boss.

I'm specifically talking about the last 30%; no problems before then.