16 Aug 2008 at 02:31 - 2
Bring a good team that knows how to hold a position. Since you'll be doing a lot of position defense and won't be moving much, spirit spammers and the like may be a more viable option than usual.
Don't remember my strat for NM, but I think this is how I did it in HM:
Push up to past the first set of stairs. Kill stuff. Hold position there, killing the torment creature or w/e and the next oncoming mob. After killing the latest patrol, proceed to pull one mob from the left or right to your position and kill them. Wait for next patrol, pull next side.
Once both sides are clear of enemies, wait for the next patrol. Kill it, and then move your forces up to the edge of the water in front of you. Pick a torment creature on either side and kill it with a light. Bring a new light from the stair guardian and set it at your position. Watch for the next mob coming and intercept it. If the guardian you free on either side dies, don't worry about it.
When a group attacks on the side where you killed the torment creature, kill it. Regen, and then pull the first mob in front of you. As you kill it, watch out for the next patrol. If it starts to move the other way, fall back. It's very important not to miss a patrol, because one false glance can cost you the mission.
When one side is clear, move more towards the center and pull the mobs from the other side, taking heed that you don't aggro too much or don't time your pulls poorly with the incoming patrols. When both sides are clear, set your forces somewhat in the center where they can intercept either mob, and go kill the torment creature on the other side of the water.
If you're going for the bonus at this point, wait to kill a patrol. When you've eliminated one, run your forces to one set of stairs or the other. Set your forces next to the side of the stairs so that they can pull the mob down, but do not walk them up the stairs. Run past the enemy to kill the torment creature, or pull the forces down and kill them. Again, watch for patrols to slip by, and fall back if you see one go the other way. Repeat for the other set of stairs.
When you're ready to finish the mission, move your forces up to about a bubble's range away from the final boss. Intercept a patrol, and then aggro the boss. Your party shouldn't have too much trouble holding it and any other patrols off while you run back to grab lights to kill it. If it does, it wasn't a good party.
I did the whole mission with H/H both times, but doing it with players can speed up the final part. Other sections may be disastrous if players rush killing torments without the rest of the team knowing what they're doing.
In short: Kill patrol, kill mob, kill patrol, kill mob, etc. Keep yourself where you can watch patrols coming from both sides and be able to intercept them.