Hi guys, I have the exact same problem as above, with the newest Steam version of the game. Does anyone have any solution for this? I have the save file from before the fight, and mid-fight (after killing Thaos and one of the guardians), if any devs interested. I'm sad about my achievements gone bye bye with this run
My save files and a crash dump + output log, if anyone interested:
https://www.dropbox.com/s/vx1dkumcnghf02p/Pillars of Eternity.zip?dl=0
I guess it just crashed after I pressed Alt-F4 ...