My game has started crashing every time i try enter the Dark Brotherhood sanctuary.

I checked the cell and people with all mods enabled with TESVEdit, and found only harmless conflicts. Then i tried moving all the people to outside the sanctuary with the console, and when trying to move Festus, the game crashes every time.

However, double checking with TESVEdit, only change to his base form is from Immersive Weapons without crash causing conflicts (and i checked that the weapon he receives isn't the problem), and there are no changes to his reference record. Checked his race too ("old people race"), only harmless unofficial patch changes there.

So, what could be causing the crash with him?

He crashes the game even with just Skyrim.esm and Update.esm enabled? Must be a corrupt file. Best to check file integrity with Steam.

Edit: No, he still crashes the game. Must be a rogue file from some mod causing the issue. this is where Wrye Bash comes handy, remove all mods, clean data folder from everything non-vanilla, and try again.

Edit 2: Of course caused by the one thing i didn't remember to check: clothing Well, problem identified, now i only need to solve it without completely removing the mod causing the issue