Bro and I just boxed this. 3 mages, monk, cleric, enchanter. All toons (no mercs). Only point this out because our means of doing this or that may differ from yours.
We entered this mission a few hours after setting our first step in the zone so we were sometimes confused by prior posts that mention this or that area. Not faulting prior posters just our ignorance made it tough.
As a first try, we entered the instance, started the event, then went to read. A few minutes later we went back to the toons only to find them all clutching their throats with X's over their eyes. Good start. We dropped it and restarted (you'll die on entering). Once you move beyond the entrance do not plan to EVER re-enter the mission via Buck from SS. You'll die (1,380,000 damage pretty much got the best of my mage's hps). If you don't believe me, ask my mage... HE BELIEVES!
Turn on particles, may have to camp to get them to show, bro did.
Pet classes put your pet's away lest pathing kills them as they stream through the haze. Pull them out when you set up the kill camp.
A few things that would have helped us
1. Don't start until you're REALLY ready to move.
2. The teleporter, Buck Witherspoon and the orbs are found:
(paste into your map files, I used somnium_2.txt)
P -312, 425, -27.7984, 0, 0, 0, 1, Teleporter
P -208.7602, -990.6011, -116.7282, 127, 0, 0, 3, Buck_Witherspoon
P -570.0000, -350.0000, 20.0000, 0, 0, 0, 1, purple
P -285.0000, -545.0000, 20.0000, 0, 0, 0, 1, yellow
P -285.0000, -660.0000, 20.0000, 0, 0, 0, 1, orange
P -705.0000, -660.0000, 22.0000, 0, 0, 0, 1, red
P -610.0000, -430.0000, 22.0000, 0, 0, 0, 1, blue
The teleporter looks like a pyramid of red bright spots.
3. When you follow all the dialogue for Buck (shortened dialogues may bug the mission they say), immediately move your group through the teleporter. We stationed the five of six at the teleporter, started the mission event (by doing Buck's dialogue within the mission) and CoH'd the monk to us. All zoned through.
4. The constant warnings at this point about the purple cloud appear to be there just to shake you up. We wield a lot of DPS and dropped the first two bosses quickly but were completely ignorant of how to get to the last two for about 20 minutes. Constant warnings, best as we could tell, nothing changed. As it turns out the other two bosses were connected to the same rooms, for the life of us we don't know how we missed the doors but we did (followed by the traditional face palm when we saw we were flying right by them looking).
5. Clear the two straight pull bosses Yngvar and Champion of Morell first.
6. Pull DreamFeader.
7. Pull Otraff via DreamFeader's room (avoid the invisible cloud). Some mentioned using a pet pull the short way and sac'ing the pet or using summon companion to save him. We let our monk show his stuff and just run him through DreamFeader's spawn point.
8. When the bosses are all down, another teleporter spawns to take you to the undead part of SS. The orbs are there (locs posted above). Here's another tidbit for the blissfully ignorant like ourselves. You must use one of the trap doors to get to the last couple orbs and back to Buck for the turnin. Stay invised, run over the three close ones, take a trap door, wiggle through the rooms, up the ladder and do the last two then head to Buck. We used a mage lest somebody actually wanted the chest loot, any class could easily complete this last step though, just be invised.
One last comment. We green ran this in about 45 minutes. Probably could do it in... gosh I dunno maybe 12-15 with what we have, maybe 8 or 9 with some real punch. Split the orb duty between 2 guys and, if you're really trying mash a quick number, maybe a 3rd head up to Buck.


