You've sort of answered your own question to certain extent... destroy the mythallar. That's where she gets her recuperative power and is almost imposiibel to kill otherwise.
As for that fearing, yes, that is problem for low Will classes like fighters and barbarians if you leveled Xanos primarily as one. Problem is; by this point all you have left for merchant is the shadow guy and I don't think he sells Owl's Wisdom or anything that will boost your Will saves (edit: just checked his store. no potions but does have alchemist's fire, acid flasks & holy water, all of which will hurt that b*tch, for a fee). That means you will need to keep moving away from her and smash the conduit wherever you can, trying to trap it into a small section, then womp it.
Your level is not bad, really. 14 is normal.
Dunno if this helps but she is subject to fire, acid & sonic damage and needs +1 or better weapon to cut through her DR whichb has high soak. Also, being undead race, she is immune to crits so figure on a long process without spells.
Did you save the Desert Fury weapon? That shoudl help A LOT against her.
edit: oops... just remembered that the Wise Wind can cast Owl's Wisdom 1/day so set up your shadow door and rest there if she dispels you. Also, the dark Wind will cast either Mage Armor to help your AC or summon a shadow to divert her attention. You could use the Dead Wind's skel summon but only 1 summon will stay at a time.
Modifié par HipMaestro, 27 mai 2012 - 11:54 .