Don't need much work in first quest. Everyone stay in left from the whispers, that is where the monsters will go. So get a bow and pull ONE group to you, one by one. Do this a few of times(18 i think, 6x3)
then, u need to kill the stygian overlords. The quest will show where u need to go. Go pulling and kill the first overlord, in the right. Then, in the left side, there are a lot of pop ups in begginin, so pass straight right until the end. The Overlord should be in the middle. Go pulling until u get him. So go back to the whispers and get next quest. Now u need to kill the Stygian lords, that are in these points
Watch out when walkin between the upper parts, where u killed the overlords. When u reach in the middle, will appear pop-ups in the start and in the end of the lines. So every1 stay in the start and let one of your party go in the middle to pop-up them. After killed, go kill the Stygian Lords. There, try to pull each one, cuz in some of them when u go near where they are will appear pop-ups. After u killed them all, return to the Whispers and get reward. Once u do it will appear 6 Smothering Tendrils. After killing a Tendril, a large number of Torment Claws will spawn accompanied by one mixed group of 6 or 7 Stygian creatures. It is recommended that u not try to fight them then and there, instead pull away and let one player finish off the Tendril, and, once killed run and pull them away to don't fight between the torment claws. After the Stygians are dead, kill the torment claws and go to another Tendril. Repeat the process until and Smothering Tendrils are dead. Congratulations, u finished Stygian Veil!