I think my best bet is something designed for horror/zombie games, as they would have the kind of art assets I need for the RPG supplement. As a reminder: it doesn’t need to be complex, but I should be able to explicitly use it for commercial purposes. I have looked at the ones mentioned last time, but unfortunately they seem fantasy-only. I do need fantasy assets, but I also need post-apocalyptic ones. I seem to be in a niche! Yay.