Like oily floors and other such. I think it would be cool if creatures or the player could slip on slick terrain and have the ‘downed’ effect on them. Bile could be slick too, making boomers a bit more annoying. What do you think?
Slick bile could be awesome because the player can vomit if you eat enough food so you could be able to fortify locations with vomit by making a thick enough bile wall.