https://gamefaqs.gamespot.com/a/forum/c/c00bca2a.jpg
Kinda surprised that I was only on run 42 when it happened, felt like I was in the 60s or 70s at that point. Not all that surprising that the Fists were the weapon I used to beat him the first time, since they kicked all kinds of ass with even a decent setup.
I had pretty much every single boon line up just about perfectly: doom on attack, water knockback on special, reflect on dash and cast, Poseidon on call...and I still just
barely
managed to beat the fucker by the skin of my teeth with a last-second call.
I managed to beat him a couple more times since then (spear and gun). I'm starting to wonder when and if the story ever comes to any kind of definitive conclusion, lol.
Simple questions deserve long-winded answers that no one will bother to read.