A mostly-useless NetHack scroll
. If non-cursed, it detects food
(or the lack thereof) on the current dungeon level
, revealing the type and location if there is any.
If the scroll
, or you are confused
, it detects potions
I guess you can't really go wrong with this one. Don't rely on this method for finding food; even if the scroll isn't cursed, you'll probably delay reading it until you're already fainting from lack of nutrition, and you'll pass out and get fatally gored by a mumak while you're staggering over to the yiffmelon you detected on the other side of the dungeon. A better idea is to be good and say your prayers. Personally I make it a priority to find a ring of slow digestion.