When i got there first time i was a lvl 30 ranger, with zippo close combat skills and i got nailed badly too. I killed her (and her dwarf brigade) with 1 point in deadly gift and releasing about 8 scorpions (talk about overkill eh?). I'd say scorpions is a good backup for those frustrating battles in a teeny tiny room (with a sight range enough to open a city in one look) when you can't afford someone to get close to you :P Having the survivor sneak ability helps with easy scorpion release too as you can enter a room in sneak mode and these bosses like Cyrion won't notice you. Although scorpions feel like a cheat ability to me, so i only use it when i'm getting frustrated (mainly being stuck in a tiny room with a boss and no place to gain distance).
Anyway now i'm warrior and i don't think i will need scorpions but i'm missing the part where i can kill mobs without them even appearing on my screen :P
Btw isn't there a Magic Shield spell? Doesn't that protect against Blind or any other magical spell? Or is blind related to spiritual resistance?