if you have replaced the Yarlscloths02 (or whatever yarls cloths that Potema wears), the game crashes when she transforms to a dead body. Yes.. this is best answer. As Potema "materializes" she needs yarlclothes03. Any texture mod here will crash game. Remove this folder and it doesnt crash. If you MUST have your custom texture you can drop it back in its folder after you have her skull safely in hand. :) This fixed mine! Thank You. Hope this helps others as well. This fixed mine as well. Thanks for providing a solution!