I can still remember my first time down on the Nashkel mines with my human mage. It was so frustrating to switch from Khalid, who had infravision, to my mage, who couldn't see anything in the dark and thus could not target with certain spells, and then I got pelted with arrows from unseen assailants. I went back to the fairgrounds and bought that Ring of Infravision! I admit I was frustrated at the time, but I was also impressed that infravision actually meant something in terms of gameplay. I have hated mines ever since.