I have not played a character in 2-3 months that would trigger the Grava’Thul spawn. I played an old character tonight, I had tweaked it some but not a lot, and it was tons easier to take on Grava’Thul, and I actually won this time. Did they make Grava’Thul easier?
Alongside other defensive mechanics -
As long as you have decent “slow resist” and dodge “Grava balls” the fight can be won.