There you go 
So… the cause of the crash is the Corrupted Vitality 20 Perk Tainted Vessel, the reactive pulse hitting the ghosts causes the crash.
The same thing happens in the devkit btw without any mods or anything, so it’s definitely not computer / mod related, but a basegame bug.
For now if you want to complete that bossfight you’ll need to reset your attributes and avoid corrupting your Vitality all the way to 20.
I’m not sure the issue is just confined to these snake illusions though, I rather think it has to do with their sweep-attack / dash and getting hit by the pulse when they have no collision.
I will make a separate bug report on it and include whatever I can.
Edit: Made report