If you have a skill point to spare, level 1 of the healing spell comes in handy, and would help you conserve potions (though that will not be much of an issue after you have the battle tower).
There are various suggestions in the topics linked to above.
If you have a save before entering the summoning chamber you could reload and level up a bit in the fjords (presumably you have completed everything in Broken Valley and Sentinel Island that you can do).
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