Removes fungal vision if it was wished for with fungalvision wish. You'll need to save this as a .cs file and put it in your Mods directory. For more info, see https://cavesofqud.gamepedia.com/Modding:Installing_a_mod

RemoveFungalVisionWish.cs

using XRL.Wish;
using XRL.World.Effects;

namespace MiscWishes
{
    [HasWishCommand]
    class RemoveFungalVisionWish
    {
        [WishCommand(Command = "removefungalvision")]
        public static void SaveBlueprintTexture()
        {
            FungalVisionary.VisionLevel = 0;
        }
    }
}