At the far end of the zone, kill the cultists: 3 level minus one even cons; 6 level minus two one down arrow, and Speaker R'tanan, level plus one (none grouped)
When you kill the first, the rest will auto-attack when you near them, even with the cowl on; the enforcers will also auto-attack as you head for the zone-out. If you hail the NPC upon entry and tell him that you were followed the 2 triple ups will zone out.
Collect 6 green-glowing scrolls around the meeting spot