This boss fight is easily the worst for me. It’s not about difficulty, skill or fun. You kill a few spiders, then spend the rest of the fight dodging one single attack he does where he slams his left fist into the ground while ranged attacking him from out of dangers range. Worse, you can’t use any area attacks on the boss or it will aggro an uncontrollable number of spiders.
Seems fine if you have a rifle, or a ranger with a longbow and specced into single target damage. But any class traited toward melee combat or AoE attacks is going to have one really boring time once the initial spiders are dead.
The spiders mechanics need to change. Make them come out in appropriate and combatable numbers only at certain intervals, aggroing directly on to any players within attacking range of the boss. If combat breaks and the tree heals up, the spiders should despawn. Let us get in there, melee, AoE or whatever we are built for instead of forcing us into a single target ranged fight.
This way we can fight the nightmare tree properly and when the spiders spawn, deal with them accordingly while keeping close eye on the nightmare tree’s main attack in the process. Kill the spiders then get back to DPSing the tree before the next lot spawn. Maybe even throw in some plant seeds like the mortars, but they grow and burst a couple of spiders out of them if not destroyed before they hatch.