Healers in each group should heal their own group if ever one gets damaged due to Cave In, and also after Shatters. Tank healers should keep the tanks topped off, especially the offtank who receives large spikes due to Hurtful Strikes. Druid healers and priests should keep HoTs on them all the time, to avoid Reverberation from killing the tanks from no healing at all for 4 seconds. Paladins with Improved Concentration Aura can be grouped up with the other tank healers, to reduce the duration of Reverberation silence. After shatters, druid healers should be ready to Nature Swiftness heal or Swiftmend the tank immediately if his health gets too low due to shatter damage.

Avoiding Shatter / Lessening Shatter Damage

Everyone should be spread out and in their respective sections in Gruul's room. If some of the ranged DPS can find a tiny slot behind stakes or rocks by the walls of Gruul's room, stay near them. Whenever Gruul's Ground Slam timer is almost up (those people who use bossmods), those with hiding spots should proceed to those spots so that when he does Ground Slam, they won't get thrown to the middle of the room with everyone and they can avoid killing most people with Shatter. Everyone else should just move away from each other right after landing from the Ground Slam. Use the 4 seconds time slot before you get Stoned to move out from everyone, to avoid or reduce Shatter damage you deal to anyone nearby and receive from anyone nearby. It doesn't matter where you go, just find a spot where no one will be near you, or just move to a spot where you are far away from anyone nearby.

Druids can cast Barkskin to reduce the Shatter damage they receive. Rogues can use Cloak of Shadows to remove Gronn Lord's Grasp debuff, then sprint out from everyone. Mages can Iceblock out of the debuff, then click it off immediately to run / blink to a safe place without anyone nearby. Paladins can shield out of the debuff and move out to safety. Everyone should be aware and move out from anyone, it's for your own safety too. After Shatter, move back to your respective positions and resume DPS / healing / tanking. Healers in every group should heal everyone up quick, as well as the tank healers should keep the tanks topped off quick after Shatter. Note that pets aren't affected by Shatter, but they still get Stoned like everyone else.

Try to adjust the raid composition if you are wiping due to lack of DPS (thus letting Gruul grow very strong), or lack of healing. Keep focused and be aware of your surroundings everytime, prevent Shatters if you can and he'll go down easily. Also having shamans cast Bloodlust / Heroism at around Grow #8 should help.

**Additional addons that help on the fight**

KTM / Omen - addon that monitors threat. Everyone should have this to monitor their threat.
Deadly Boss Mods / BigWigs Bossmods - bossmod addon which help the raid provide cooldown timers for Gruul's abilities.

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