rpg with a botany skill
where the first few levels you unlock the ability to make food and medicine from the plants,
and then it seems like it stops having any mechanical benefit
but if you keep leveling it up, the amount of plant models in the world increases as you notice more plants, and then you start hallucinating connecting lines between them, words drifting off the plants reflecting who they're related to, folklore about them spirals like ghost words, you become less and less able to be around settlements, indoor spaces and towns cause ambient harm, the plants start talking to you, you start dreaming about them, you get healed just from merely being around them
anything can break your mind if you try hard enough