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Gruul the Dragonkiller

Gruul the Dragonkiller abilities:

Growth: A self-buff which starts 30 seconds after you engage him in combat. Growth increases Gruul's size, damage done by 15% per stack and 15% damage done per tick from "Cave In" and Hurtful Strikes. Stacks up to 30 times. It's advisable that you kill him before his 18th Growth because then it will be impossible to heal anything that's going on.

Cave In: Gruul's hits makes the entire cave tremble for the whole fight making rocks from the cave ceiling fall down on random positions dealing heavy damage. You will get a debuff if you stand in the Cave In and will have approximately 2 seconds to get away from it. It's relatively easy to see since you can see boulders shatter on the ground.

Ground Slam / Gronn Lord's Grasp / Stoned / Shatter:

Every now and then (approximately 45 seconds cooldown) Gruul will smash the ground making everyone fly in the air to random positions. Upon landing or when the Ground Slam debuff expires you will get a debuff called Gronn Lord's Grasp which stacks every second up to 10 times and reduces movement speed by 10% every second. When it's fully stacked you will become a stone figurine, which is unable to act (some abilities are still possible, more to that later) for a short duraction then Gruul will Shatter you dealing damage to everyone in your range, the closer they are the more damage they will take from your Shatter and vice versa. If you stand right onto another player you will both suffer 9000 damage, if you are at 15 yard range you will suffer 70-100 damage. If there is no one in 15 yard range of you, you will not take any damage.

Reverberation:
Area of Effect Silence that silences for 4 seconds. Resistable and it's affected by talents like Focused Mind, Unbreakable Will and affected by items that reduce silence effects by x%. This can be outranged and have around a 45 yard radius.

Hurtful Strike:
Hits the person second on the Threat Meter for a fixed amount of damage which is increased by the Growth Buff. It hits normally for 10000-13000 on people with 0 Armor.

Positioning:

This fight is basically a major DPS race with one exeption. Due to the randomness of the Ground Slam mechanic it's important to spread out accordingly. My suggestion would be like this:

Party 1 consisting of 1 Paladin, 1 Warlock and 3 Tanks.  - Tanks in middle with Gruul. Warlock and Paladin Far Right corner.

Party 2 consisting on pure melee DPS. - In the Middle together with tanks.

Party 3 Far Left corner.

Party 4 Near Right Corner.

Party 5 Near Left Corner.

Countering Gruuls abilities:

Growth: Self Buff so cannot be countered.

Cave In: Boulders will shatter at the place where Cave In is happening so move out of it fast. As soon as you get the Cave In debuff you have 2 seconds to get out of it before you will start taking damage.

Ground Slam / Gronn Lord's Grasp / Stoned / Shatter:
The only thing you can do is to move away from everyone as fast as possible and eat the damage. Priests can put a Shield up on themselves aswell as Renew to minimize the damage. Druids can Lifebloom themselves a sec before you get stoned, while Stoned use Barkskin to reduce the damage, when he shatters you the lifebloom tick will put you back to full HP. The rest can only hope to be far away from each other.
IMPORTANT: NEVER EVER STAY CLOSE TO A TANK, MOVE AWAY FROM HIM EVEN IF IT WILL GET YOU OR YOUR TEAMMATE KILLED!!

Reverberation:
Since the timers on this spell are rather unstable from bossmods you will have to eat it. The only thing you can do is to have full HoT's on the tank and always keep him at 100% health.
Nature's Swiftness+Healing Wave/Nature's Swiftness+Healing Touch are good panic buttons if the tank gets low on HP when Reverberation expires.

Hurtful Strike:
The awe of Hurtful Strike is that if your secondary tank dies he will start killing your melee DPS, and guess what happens when they are all dead? The Main tank will start to take normal hits aswell as Hurtful Strikes which can easily 2shot the tank. So to avoid this have a "Soaker" tank, best choice is a Druid because of high armor and health and don't let him die!


Healer Roles:
Keep your 2 tanks alive, means heal them to full, heal them even more THEN you can heal the rest of the raid. The fight ends when you have 1 tank left.

Melee DPS Roles:
Nuke as fast and as hard as you can without overaggroing the secondary tank. If you do, you will die from the next Hurtful Strike. This is a DPS race so push it to the limit.

Ranged DPS Roles:
Consider yourself on your own. That means you're the last person who will ever get a heal.
Bring Bandages for this fight since you're gonna need them. You get more or less free play here so you can nuke the living crap out of Gruul and even more, just watch out for overaggroing him since you will wipe the raid if you pull him away from the middle, due to Hurtful Strikes. Also your main problem here will be Cave Ins, try and not to get hit by it, cancel your spellcast even if there's a 0.5 sec left on it and get away from Cave In.

Tank Roles:
Maintank
Use all your rage on getting as much Threat Per Second as possible so you can keep Gruul glued to yourself because the raid will have to do massive DPS on him. If you get low on HP at 14 or higher Growth use Shield Wall and Last Stand asap to buy your healers some time!
Offtanks:
The Druid tank should focus in getting steady Threat Per Second, with the combo of Mangle and Lacecrate stackings, use Demo Roar on Gruul aswell.
Your third tank should be a warrior, Thunderfury helps a great deal here because of the 20% attack speed reduction, and it stacks with Thunderclap!

Note that he is Immune to Taunt