I'm terribly level drained, fighting at half my capabilites, and so's poor little Deekin. How to fix it? Lesser restoration ain't doing it. Nothing is.

Suggestions?

Restoration and Greater Restoration do.
You could also spent a Rogue Stone to place a portal at where you are and use the Reaper's Artifact to make a quick jump to the seer and back so she can heal you, this should restore you (it always did with the other temples). I just avoid this by using (epic) amulet of health (or something like this that gives you level/ability drain immunity).

Ahhh, thanks! Hmm, I seem to remember having the amulet of health at this point, last time I went through the game...I should have found it before running across all these undead.

IIRC the genie from the bottle sells a few rings that collectively equal the protections of a Greater Amulet of Health (except maybe the regeneration) if you can't find one.

I am never without one of the amulets of health, and get a greater one as soon as possible.

Also, I'm almost positive there's a "Bone ring" somewhere in that area, which makes you immune to level drain.

I finished the area. I just died a few times, and got my levels restored. :) I didn't stumble across a bone ring, though, I don't think.

(SPOILER-------damn dracolich...used all my rogue stones------END SPOILER).

Arte, you were right. That was BY FAR the best of the three.