I may give Burning Wall a try: I still have a spare six points to spend on something interesting. The main trouble is that even when I use Flash Attack, the Beige Shield of Invulnerability comes up before my sword strike even happens and it's all downhill from there; I'd hoped to get away with shadow potions and area attacks but I still turn visible as soon as I use Hell Spikes (which have no effect anyway thanks to the Beige Shield) and she immediately skewers me back, at a huge health cost in spite of me having 100-200 shielding against the various types of elemental attack (though I'm not sure they're relevant).
I'll try the Burning Wall but I may need to resort to cheating!
