If you go down the hallway just a bit, you'll notice another room with nothing in it.  However, the developers have put traps in the room which will quickly drain your mana.

If you have a large group, I suggest the first buff room.  If there are only a few, this room is great.

It seems that if you stand just inside the room, right next to the door, the mana traps will not affect you.  On top of this, you can take your time.  The Umbris are of no worry here.

In any case, buff up with the protections listed in Step #18a.  You're 1/2 way through the keep!

When everyone is buffed and ready, exit the buff room and turn left.  The door staight down the hall is your next obsticle.

Hugging this door will be some Relic Bones and maybe a Dark Revenant.  Imperil / Vulnd all the ones at the door and in the surrounding area before opening the gate.

Once the creatures are ripe, pluck them off.

Note:  You will be in target range of some Nightmare Wisp spells just past these gates.  Keep yourself healed.  They cannot physically reach you, and you can't physically reach them.  Leave them alone for now.

Just beyond the door mentioned in step 19 are 3 passages.  One left, one forward, and one to the right.  The one going forward will not be used.

Once all creatures in this area are cleared away, one person must make a run though the room on the right to another room beyond it to pull a lever.

It is recommended that the person making the lever run have a full set of protection items.  Chances are, the lever runner will get hit with a dispell and mana blight trap.

All other players (those not making the lever run) are to wait in the room to the left.  Just open the first door you see and wait inside.  You will see another doorway leading down....this is the door that will open when the lever is pulled.

As mentioned in step #20a, enter the room seen here by turning right.  Once in the room you will notice to open paths one to the left and one to the right.  Go through the one to the left.

Please note, you WILL have creatures tailing you.  Keep yourslef alive but don't worry about killing them yet.

Just across the hall from the open path mentioned in step #21 is the room the lever is contained in.  There are 2 Firestorms, Relic Bones, and Dark Revenants in here.  Igone them all and run in for the lever while trying not to get killed......but beware.....

.......just as you enter the room with the Lever and Firestorms is a dispell trap.  It is sometimes avoidable if you jump over it on your way in and on the way back.....but chances are, you'll trip it.  This is why someone with a full set of protections is optimal for this run.

The lever is located in the back left corner of the room.

Once it is hit, the door where the others are waiting will open.  Make sure everyone gets in, but don't go all the way down the slope past the door.

Have someone ready to recast protections and heal you on your way back to the group.

Get yourself regrouped with the others.  Just backtrack.

Go though the passageway that Meryl is pointing to in the picture and run straight where everyone is waiting.

As seen in the picture, Meryl is pointing at the door that opens when the lever you just pulled is triggered.  Make sure everyone is just inside the door.

At this point, you have gotten the attention of several Nightmare Wisps.  They still can't reach you but with only life magic.

Have the group stay here and recast anything that was dispelled.  I would recommended recasting level VI and under spells if progress has been slow.

*Realistic corpse coutisy of someone who didn't follow this guide..