New spell “seek item”, mid to high level divination. When cast, you are prompted to name an object type (or use the wish prompt to allow more details to be specified - i.e. a +5 broadsword as opposed to any broadsword). Then the entire dungeon is searched for matching items and tells you where they are found, probably just telling you the level for objects not on the current level and showing you the locations of objects a la object detection if they are on the current level.