10-Man Guide by Solarflair:
Complete Dungeon Journal on Wowhead.com
What's up guys and welcome to the Throne of Thunder raid guide. My name is Lore, and this video will cover the Normal version of the Jin'rokh the Breaker encounter. Please note that although this video is focused on the 25-man version, there are no major changes to the fight on 10-man.
As the first boss in the instance, Jin'rokh is pretty simple in terms of mechanics. Shortly after the pull, he'll pick up the tank and throw them across the room at one of the nearby statues. That will smash the statue open, causing a pool of Conductive Water to start forming on the ground in front of it. It also stuns that tank for 8 seconds and causes them to lose threat, so your second tank will need to pick up the boss immediately.
The Conductive Water serves as the core mechanic of this fight. Everything interacts with it in some fashion or another. First off, by standing in the pool, you'll get a debuff (Fluidity) that increases the nature damage you take by 80%, but also causes you to deal 40% more damage and receive 40% more healing. Everyone except the tanks should stand in this as much as possible. The boss should be positioned towards the middle of the room, so that melee can stand at the edge of the puddle, and your ranged DPS and healers should be towards the back of the puddle near the edges.
Now, the reason you want ranged positioned like that is due to his Focused Lightning mechanic. Every so often he'll summon an orb of lightning which fixates on a random ranged DPS or healer and chases them until it eventually reaches them and explodes. Normally, that explosion deals a decent chunk of nature damage to whoever it hits -- it's enough to hurt, but it's totally manageable. However, if that person is standing in the Conductive Water, it'll basically 1-shot anyone caught by the explosion and deal a massive amount of damage to everyone else. That's pretty much a wipe if it happens. So, as soon as you get picked for the Focused Lightning, you need to run off to the side to an area where there is no Conductive Water before letting the ball hit you.
Once a Focused Lightning has been safely detonated it'll leave behind a Lightning Fissure. This is a little jet of lightning that's pretty easy to notice. They deal a small amount of damage to anyone standing near them, but since everyone should be standing in the pools most of the time anyway, that's not a big deal. What's more important is that if another Focused Lightning gets kited over top of an existing Lightning Fissure, it'll cause an Implosion which deals a huge amount of nature damage to the entire raid, especially considering the 80% increase from the conductive waters. Basically this just means that you need to be intelligent about where you let Focused Lightnings hit you. Kite them a good distance away so that there's plenty of room for the next one.
There's also a tank debuff to keep track of called Static Wound. Every so often, Jin'rokh will use an ability called Static Burst. That deals about 100,000 damage to the whole raid -- even with the 80% increase from conductive waters, it's still not a big deal to heal through. What's more important is the Static Wound debuff he'll put on the tank a couple seconds later. That causes both the tank and the rest of the raid to take a big pulse of damage every time the tank gets hit. Tanks need to be ready to swap aggro immediately the second that debuff goes up to avoid a whole bunch of unnecessary damage on both themselves and the raid.
The only other trick up Jin'rokh's sleeve is a Lightning Storm. He casts this on a timer that lines up to be shortly after a conductive water has filled an entire corner of the room. Two things happen here. First off, the entire raid will be taking some heavy nature damage for the full duration of the lightning storm. Second, he'll electrify the conductive water you were just standing in -- now, instead of buffing your damage and healing, it'll cause you to take extra nature damage on top of the 80% increase. So this is pretty straightforward to deal with. Get out of the conductive waters before the channel starts, and then heal like crazy to keep everyone alive. We found it ideal to just have all the ranged and healers stack up on melee so that raid cooldowns could be used effectively and DPS could continue. Once the Lightning Storm is over, he'll throw the tank into another statue, which creates another conductive water, and the fight will continue on as before.
That's basically all there is to Jin'rokh. Just kite Focused Lightning intelligently, swap aggro on the boss effectively, and heal through the damage. As long as you can manage that, even an undergeared group should have a good shot at taking Jin'rokh down.