Wikipedia
Elminster Aumar is a fictional character in the Forgotten Realms campaign setting for the Dungeons & Dragons fantasy role-playing game, also known as the " Sage of Shadowdale". He is a powerful wizard featured in many novels by Forgotten Realms creator Ed Greenwood. His appearance and demeanor in certain aspects seem to echo Merlin, Gandalf, or Odin.
Elminster was one of the first characters that Greenwood created for the Forgotten Realms. Information about him can be found in virtually all game products, but The Elminster Series of novels by Greenwood are perhaps the most definitive sources of information. The series includes Elminster: The Making of a Mage, Elminster in Myth Drannor, The Temptation of Elminster, Elminster In Hell, and Elminster's Daughter.