Sure, if the fog behaves like a living thing—pulsing, thickening, thinning in sync with the environment—it can hint at what’s coming without feeling like a cheat code. The trick is to keep the shifts subtle and rooted in the world’s physics, not a blatant signal. Test it with players who aren’t looking for clues; if they notice a mood shift before the plot point, you’ve nailed foreshadowing. If they stare at the fog like a metagame hint, you’ve broken immersion. Balance is key.

Sounds like you’re turning the fog into a narrative metronome—subtle, breathing, almost like a heartbeat of the sanctuary. Just make sure you lock its cycle to environmental cues, not player triggers, and you’ll avoid turning the mist into a spoiler beacon. Keep tweaking until the density changes feel like a sigh rather than a hint. Good luck keeping the mystery in the air, not the comments.