Chaos, aswell as a combination of 3 different Field graphical mods, ozm, avalanche, and i forgot the other one (i unpacked them, overwrote a few times and then repacked them, maybe that is where i went wrong??).
I ended up cheating and making myself Invincible with another mod just for that 1 boss fight. But I kept a save right before it if I ever feel like trying to fix the error.