I don't even use invisibility, it's pretty easy if you just go right up the middle and then cut to the door that opened and keep running. If you run to the bridge, all the adds despawn for your teammates so all they have to do is get past the shriekers.
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just jump down to the boss and your teammates will spawn into the room from whereever they are...
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Well yeah, but then they'll miss the goofy looking line of thrall running at you :) I can't help but chuckle at that party every time, lol
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i just run to the right of them and never shoot any (unless i need some green ammo)...they just ignore you..lol
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They just look like speed skaters trying to skate uphill to me!