Forgotten Realms
The "Campaign Set" (often referred to as the "Grey Box") was later released in 1987 as a boxed set of two source books ("Cyclopedia of the Realms" and "DM's Sourcebook of the Realms") and four large maps, designed by Greenwood in collaboration with author Jeff Grubb. The set introduced the campaign setting and explained how to use it, and reserved space on the map for SSI's Gold Box computer role-playing games set in the Forgotten Realms.
Time of Troubles (Forgotten Realms)
On the fictional world of Toril, the planet on which the Dungeons and Dragons fantasy setting The Forgotten Realms is based, The Time of Troubles was precipitated by an attempt by two of the settings' deities, the gods Bane and Myrkul, to steal the Tablets of Fate from the overgod Ao. The tablets were created by Ao and delineated the areas of responsibilities given to each deity: his or her "portfolio" over which each of the gods of the Forgotten Realms have domain. Angry with the gods for their habitual pursuit of power and negligence toward their mortal faithful, the theft of the Tablets resulted in Ao banishing all of the gods save Helm (selected to protect the gates to the heavens) to take on avatars and live as mortals on Toril. The novels covering this event and subsequent game products take place almost exclusively on the western continent of Faerûn.