Callarduran Smoothhands, Deep Brother
Callarduran Smoothhands is by nature solitary and thoughtful, and he rarely consorts even with other gnome gods. He is a benign but secretive deity, caring only for his own people and their defense against drow and the other dangers of the Underdark. He intercedes to defend his followers from such dangers, and his appearance is heralded by a loud humming which can be heard through solid rock.
Published in Forgotten Realms Campaign Guide, page(s) 81.