Crystal ball

The crystal ball is the most common form of scrying device: a crystal sphere about 6 inches in diameter. A wizard can use the device to see over virtually any distance or into other planes of existence. The user of a crystal ball must know the subject to be viewed. Knowledge can be from personal acquaintance, possession of personal belongings, a likeness of the object, or accumulated information. Knowledge, rather than distance, is the key to how successful location will be, as well as how long and how frequently a wizard will be able to view the subject. Certain crystal balls have additional powers, such as clairaudience, ESP or telepathy.

Note: This version of the crystal ball originally appeared in the 2nd Edition Dungeon Master Guide for the Advanced Dungeons & Dragons game by TSR. Their inclusion here is for the purposes of providing context for the campaign only.