Just found one, but called "An Iksar Slave", no Tormented in the name. I guess he was the one they treated nice, gave all the easy jobs too... must have been the suck up of the lizards, so I killed him for all those other downtroden slaves! Viva la revolution!
Kited one of these fellows using poison, cold and disease dots. I was not able to get either of the poison or disease dots to stick, and the cold stuck about 70% of the time. Pretty resistant buggers...be careful!
I have been root/roting these thing last night and the magic resistance is not that bad. Haven't had a single resist, out of 10 or 2 mob (with magic based spells: winged death, snare and root). BUT fire and cold nukes or DoT did not land....not one time....
So i'd say they have hight poison, desease, fire and cold. But the magic resist is lower.
The bottom level for these is either 43 or 44. Some are light blue to me at 60 but most are dark blue. Everything 45+ is dark blue to a level 60 so the levels on these are slightly wrong.
They have 5k health give or take a few hundred.
As far as see invis goes, NOTHING that isn't undead sees invis (not sure on some of the nameds) and if the undead, ANY undead can see invis but it seems like less than half of them do. That's still enough that you can't just go running arround, though. The skeletons lay on the ground so sometimes you can't even see them until you're right on top of them.