Got lucky after several attempts and caught it in its grace period. Used hallowed invocation, liquid vim, climbed up onto its back and finished it with a fully upgraded Dragon Forged Virge of Madness.
PRAISE THE GOOD LORD!! HES COMING SOON "For God so loved the world He gave his only begotten son For whosoever shall believeth in him shall not perish but have life Everlasting!" Also this game scared the crap outta me- gotta play it again
Square Enix is the most boomer game developer to make these "easter eggs" aka secret locations. It's so obvious way that I had to search for it. Thanks anyway.
I did looking up videos on this because the same thing happened to me and the boss is level 49 while my characters are level 13. I fought him for like half an hour got him maybe to 75% health, but couldn’t hold off after that. seems like it’s something you’re supposed to come back to later