Bom o básico o pessoal ta fazendo certo, e até o posicionamento também, infelizmente o DPS ta pouco e precisamos aumentar o DPS para ele deitar mais rápido.
Achei essa imagem mostrando um diagrama de posição muito bom
Abilities -------------------------------------------------
Growth:
Increases damage done by 15% every 30 seconds, size increased by 10%, can stack up to 30 times.
Hurtful Strike:
Occasionally hits the 2nd highest aggro. A second tank is needed to mitigate this, 12350-13650 physical damage.
Reverberation:
AoE Silence (4 seconds) on a random timer. Unlimited range.
Cave In:
Random AoE which causes ~3000 damage every 3 seconds in the area. This occurs more frequently in later stages. This counts as melee damage and can be mitigated by armor. Growth also affects Cave In. Look like a blizzard but with stones, and it can move a little. There is always one up throughout the fight, just move away if it's on you.
SHATTER PHASE I - Ground Slam:
First spell of a chain. Gruul will slam the ground and knockback every player in a random direction (20-40yds). Once landed, everyone will have to spread out immediately.
SHATTER PHASE II - Gronn Lord's Grasp:
Second spell of a chain. Stacking debuff after a Ground slam that reduces movement speed by 20% per stack. Stacks 5 times. After 5 secs it causes Stoned. Players must space out between each other during these 5 seconds to avoid the effects of Shatter. Goal is 15 yds from the nearest player.
SHATTER PHASE III - Stoned:
Third spell of a chain. Everyone is stunned. Followed immediately by Shatter.
SHATTER PHASE IV - Shatter:
Foruth and final spell of a chain. After being Stoned, Gruul will shatter everyone. The damage dealt is proximity based. If 2 or more players are 0yds between each other, the damage dealt will be around 9000. The more apart players are, the less damage is taken - no damage will be taken if players are 15yds away or more.