Element sheild was/is essential for me to take the edge off her earthquake spell. Canned elementals a great help to distract her and do a little damage, and purify air as she occasionally casts either death or draining cloud-- get a scroll or ring if you don't have the spell.
Armor melt also helps. You can also run past her {she will generally see and engage you, just keep running] to the cave with 'davey jones locker', and check for excal there: will be a lot easier to take her on if you have that. If it isn't, reload a save from before you enter the area to reset the chest. Once you have excal, rest, resave, rebuff, attack.
Oru
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