Im doing a challenge where i can only use the starting axe for pyromancer and pyromancy to beat the game. I was on the gaping dragon with a +2 hand axe, it took 15 min and 49 damage per swing while doing it 2 handed light attack. 15 min later i beat the gaping dragon. His attacks arent even that hard to dodge its just so suspensful him being at like 500 health left for like 5 min and only doing 49 damage per swing. (I didnt have any resin.)
Good for you. It sounds challenging; not because of the boss' difficulty as to say but instead the endurance such a fight would need, and as you said, the tension it delivers. Good luck with the rest of your challenge.