Doesnt crash the server but the fight crashes and kicks me saying it ran into a problem.
Always happens when he summons the swords and pulls me to the center. I don't die, he still has health, just says ran into problem and then the fight stops and I have to leave the game for it to reset cause I can still see gaia but other players cannot

crash-2021-02-17_13.08.51-client.txt

pretty sure these are some crash reports of it:
crash-2021-02-17_13.01.45-client.txt

crash-2021-02-17_12.48.03-client.txt

UPDATE: Figured it out, floating too high and it would end the fight.