I THINK,i figured out rimshadows!!! So basically bear my needing out, but the edge of shadows or lights have a weird phenomenon where they're brighter/darker with more contrast,but i wasnt sure how to pull it off,i think i just managed to ,to a certain degree!
https://drive.google.com/file/d/1VDrA9L57JhDBQXy6XTryD3jyAT0dN55m/view?usp=drivesdk