I won't lie, a lot of what I think up is at least partly inspired by things I'm watching/reading/listening to. This prompt for example was based off of a YouTube video discussing a different method of turning character backstory into plot tie-ins. I don't recall exactly what sparked the 'weird cave' vibe but I had the rogue thought pop into my head and that was that - I had to write it down. And, I've come to realize that anything I write down I can basically adapt to a prompt. Doesn't matter if it's a saying/phrase, a question, a scene, character, etc... if I have a word or more that I've felt the need to jot down it's something I can convert later (sometimes I just have to leave it somewhere I can see it for a few days while the back of my mind works out HOW to use it lol).
RE: Worldbuilding Prompt #646 - Reality Warping