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If you have a nt/collar/diadem you can use incant instead of gut. So one you're out of endurance you can switch to willpower
Results of disembowel testing | Knight limb counter | GMCP AB files
With higher denizen health pools, and less frequent shielding, the endurance drain on dragon bashing may not be as bad as it was previously. Summoning breath weapon has a pretty hefty endurance cost of 100, if I recall correctly, so frequently using that would burn through endurance.