Disk of History (Magic Disk)

This crystal disk is about 5' thick and 25' in diameter. It is a disk of history, similar to a crystal ball, used by the dragons to observe past events. Events observed in the disk of history are seen as a series of silent images, the end of one blending into beginning of the next. A user must concentrate on the event he or she wants to observe. The event appears in the disk in 3d20 minutes. It is important that the user concentrate on a specific event. For instance, concentrating only on a mental image of Artha won't work. However, concentrating on Artha's last stand on the Peak of Clouds in the Aslivar Range will display that battle.
Success with the disk of history is not automatic.
It cannot conjure images more than 500 years old. A character may attempt to use it only once per day. A person's base chance of success is 10%. A dragon's base chance of success is 20%. This is modified by: 
Apply any of the following:
: Dragons, each age level above +5% very young
: Others, each point of Wisdom +5% above 15
: The event occurred on another plane of existence -20%
: The user has previously observed the same event in the disk of history +20% 
Apply only one of the following:
: Event is one in which the user participated +20%
: User is well informed about the event +10%
: User is slightly informed about the event +5%
The DM may use the disk of history to answer questions about previous Dragonlance game events, as well as to review previous events of the current adventure. 
Category:Encyclopedia Magica Magic Items
Category:Magic Items
Category:Magic Disks