Hey y'all, hoping someone with more knowledge than me can answer this. Basically I want to make a map where the background renders completely as black, like when you have the background turned off. (Because I want some walls to essentially be "invisible" by making them almost-but-not-quite black so they blend in, and of course this doesn't work if you can just have the background on.) Is this possible by being clever with the map's colour palette / some other means? Or am I out of luck?

Thanks for your time!