Oerth was home to prominent wizards such as Bigby, Drawmij, Tenser, and Mordenkainen whose spells were well known on Toril. Mordenkainen was an acquaintance of Elminster's; the two had met on numerous occasions at Ed Greenwood's house on Earth to exchange spells and lore.[note 1] Mordenkainen, when he had newly mastered interplanar travel, used to visit Waterdeep with some regularity.
When Harkle Harpell entered into an unorthodox contest of wizardry with the Sea Sprite's wizard Robillard, Harkle and Robillard mentioned a number of Oerthly wizards, including Bigby, Melf, Otiluke, and Tenser. In particular, Robillard regarded Bigby as one of the most powerful and impressive wizards of all time, on any world.
The year 1371 DR appears to be equivalent to 591 in the Common Year timeline used in parts of Oerth, assuming the Forgotten Realms adventure For Duty & Deity and the Planescape adventure Tales From the Infinite Staircase (which were marketed as crossover adventures) both took place in late 1370 DR, and assuming that the adventure Die Vecna Die! (which included scenes in the Greyhawk, Ravenloft, and Planescape settings) took place a few months after Tales From the Infinite Staircase and Faction War, which seems evident from the political situation in Sigil.
This is supported by the "Wizards Three" series in Dragon Magazine. In Dragon #185, it's stated that the events of the novel The Parched Sea, which takes place on Toril, have just recently occured. "Novel Ideas" in Dragon #196 places The Parched Sea in 1360 DR. Dragon #185 also places the meeting described in that article prior to the events of the adventure Vecna Lives (which happened in 581 CY according to the Greyhawk supplement The Adventure Begins), which suggests that 1360 DR equals 580 CY.
In the Spelljammer setting, Realmspace is part of a celestial configuration known as the Triad, which also includes Greyspace, where the world of Oerth is found, and Krynnspace, home of the world of Krynn and the Dragonlance campaign setting. The Phlogiston, a rainbow-colored chaotic liquid that surrounds the spheres, has a strong current that flows from Realmspace directly toward Greyspace, making travel in that direction relatively simple; due to this current, it is impossible to travel directly to Krynnspace from Realmspace. From Greyspace, however, it is a relatively simple matter to travel to either Realmspace or Krynnspace, strong currents leading to both spheres. From Krynnspace one can easily move to Realmspace, but travel directly to Greyspace from Krynnspace is impossible.
- ↑ Jeff Grubb (August 1989). “Concordance of Arcane Space”. Spelljammer: AD&D Adventures in Space (TSR, Inc.), p. 78. ISBN 0-88038-762-9.
- ↑ Jeff Grubb (August 1989). “Lorebook of the Void”. Spelljammer: AD&D Adventures in Space (TSR, Inc.), p. 89. ISBN 0-88038-762-9.
- ↑ Ed Greenwood (November 1994). “The Wizards Three: A Night of Shadows”. In Kim Mohan ed. Dragon #211 (TSR, Inc.), p. 84.
- ↑ R.A. Salvatore (August 2008). Passage to Dawn. (Wizards of the Coast). ISBN 978-0786949113.
- ↑ Sargent, Carl. Ivid the Undying (TSR, unpublished). Available online: 
- ↑ Ed Greenwood (1993). The Code of the Harpers. (TSR, Inc), p. 48. ISBN 1-56076-644-1.
- ↑ Jeff Grubb (August 1989). “Concordance of Arcane Space”. Spelljammer: AD&D Adventures in Space (TSR, Inc.), pp. 86,88. ISBN 0-88038-762-9.
- Monte Cook (1998). Tales from the Infinite Staircase. (TSR, Inc). ISBN 0786912049.
- Cook, Monte and Ray Vallese. Faction War. Renton, WA: TSR, 1998.
- Cordell, Bruce, and Steve Miller. Die Vecna Die!. Renton, WA: Wizards of the Coast, 2000.
- Dale Donovan (May 1998). For Duty & Deity. (Wizards of the Coast). ISBN 0-7869-1234-0.
- Ed Greenwood (September 1992). “Magic in the Evening”. In James Ward ed. Dragon #185 (TSR, Inc.), pp. 57–63.
- Ed Greenwood (December 1992). “The Wizards Three: Sorcery from Three Worlds”. In James Ward ed. Dragon #188 (TSR, Inc.), pp. 27–34.
- Ed Greenwood (August 1993). “Three Wizards Too Many”. In Roger E. Moore ed. Dragon #196 (TSR, Inc.), pp. 82–92.
- Ed Greenwood (December 1993). “The Wizards Three: Once more the three”. In Kim Mohan ed. Dragon #200 (TSR, Inc.), pp. 22–25.
- Ed Greenwood (November 1994). “The Wizards Three: A Night of Shadows”. In Kim Mohan ed. Dragon #211 (TSR, Inc.), pp. 82–86.
- Ed Greenwood (August 1997). “The Return of the Wizards Three”. In Dave Gross ed. Dragon #238 (TSR, Inc.), pp. 42–49.
- Ed Greenwood (December 1997). “Jest the Wizards Three”. In Dave Gross ed. Dragon #242 (TSR, Inc.), pp. 48–52.
- Ed Greenwood (April 1998). “The Wizards Three: The Night It Wailed Wizards”. In Dave Gross ed. Dragon #246 (TSR, Inc.), pp. 86–92.
- Ed Greenwood (June 2006). “A Dark and Stormy Knight: Another Evening with the Wizards Three”. In Erik Mona ed. Dragon #344 (Paizo Publishing, LLC), pp. 56–61.
- Ed Greenwood (September 2007). “Goodbye and Hello, as Always: One Last Evening with the Wizards Three”. In Erik Mona ed. Dragon #359 (Paizo Publishing, LLC), pp. 79–82.