Daern is a Oeridian hero-goddess of Defenses and Fortifications. She constructed some castles and other things on Oerth in her time and made the prototype for a well known magical tower as well. Her apotheosis was sponsored by Delleb.
Source
Living Greyhawk Gazetteer, http://www.wizards.com/rpga/downloads/LG_Deities.zip
Living Greyhawk Journal #3
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