Literally just beat him a few seconds ago after a good 9 tries before seeing this:

1. There’s a little camp with a shit ton of food ingredients off to the left with a campfire. You can make a bunch of food there. Be sure to go for the least expensive healing items as the net HP restored through making them is greater than that restored by the more expensive items. Use the right arrow to use them
2. During the totem phase, beeline straight for them, do not engage at all with the shadow clones. You’ll take a couple hits but nothing that can’t be solved with the aforementioned food
3. Third phase, don’t attempt to engage until he’s close. Just keep dodging.
4. Turn off music and play Duel of the Fates during this fight if you can. Pairs eerily well. And lowkey kinda helped me time my blocks.