The Fires Of Windameir

Description for THE FIRES OF WINDAMEIR by Niel Hancock:

Return to the world of THE CIRCLE OF LIGHT...
The magical universe where man, otter, bear, and dwarf together fought demonic forces of darkness in the struggle for their world. Here, in the twilight age of Atlanton Earth, you traveled with the mighty magician Greyfax Grimwald and his allies. Now you'll go back to time before time, the enchanted dawn of Atlanton Earth -- and a thrilling new quest.

THE FIRES OF WINDAMEIR
Young Owen Helwin, bearer of the mystic Sword of Skye, and the wonderful talking steeds Seravan and Gitel, must descend into the heart of danger deep beneath the ground. Here amid the misshapen creatures of the Darien Mound, Owen's task is to find and protect the magic Wells of Trona from the minions of the Dark One... and break the terrible spell of a traitor.

This is #1 in Windameir Circle Series.