I find it is easier to tank that fight if you stay close to the inside. You don't have to move as fast, and you can use the center structure to break line of site from the boss if you need to take a break from his damage (bigger deal on HM). He gets hung up on the edges, so it slows him down too.
A lot of big attacks are also percentage health based, so no matter what health you have you will die or take a % of your health in damage if you do not follow the mechanic.
I find it is easier to tank that fight if you stay close to the inside. You don't have to move as fast, and you can use the center structure to break line of site from the boss if you need to take a break from his damage (bigger deal on HM). He gets hung up on the edges, so it slows him down too.
A lot of big attacks are also percentage health based, so no matter what health you have you will die or take a % of your health in damage if you do not follow the mechanic.
.........
I gave up 4 or 5 times straight after coming back last month on the same boss. Every time we had a fake tank and two dps who are unfamiliar with the map, I can't heal anyone killed by one shot or resurrect them since I can't take the unblocked hit even with 30k HP and 20k resist. Sometimes it doesn't even look like heavy attack - I was several meters away but still died, parsing shows 20k plus a number of other attacks that must have been fired together.
Attempting to be tank myself didn't work out as stamina was running out fast while blocking. Was the boss stronger than years ago? I just checked I collected nearly all 3 sets including weapons and jewelries.
If it's health based, I'd just quit whenever I get the same dungeon again.
I have heard pug tanks are not good. Boss does a large cone attack and anyone inside the cone gets a lightning aoe, anyone inside someone elses lightning aoe takes damage when the person with the aoe takes damage. Not sure of any one-shots though other than the lasers.
If you’re running out of stamina, there’s something wrong with your build. Check your cp, passives, and armor traits (sturdy if you block a lot). What class do you tank with?