In the Dungeons & Dragons World of Greyhawk campaign setting, Theodain Eriason is a powerful elven wizard, and one of the newest members of the Circle of Eight. Theodain is the Circle's first non-human member. A native of the Yeomanry, Theodain operates throughout the Sheldomar Valley.
- Anne Brown (1998). Greyhawk Player's Guide. TSR. ISBN 0-7869-1248-0.
- Mona, Erik, and Gary Holian. "Wheels within Wheels: Greyhawk's Circle of Eight." Living Greyhawk Journal #0 (Wizards of the Coast, 2000). Available online: 
- Moore, Roger E. Return of the Eight (TSR, 1998).
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