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The Golden Torc (original 1981; edition 1982)
by Julian May
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Wikipedia in English (1)
Amazon.com Product Description (ISBN 0330267191, Paperback)Exiled beyond the time-portal into the world of six million years ago, the misfits of the 22nd century are enmeshed in the age-old war of two alien races. In this strange world, each year brings the ritual combat between the Firvulag and the Tanu. This is the sequel to "The Many-Coloured Land".
(retrieved from Amazon Mon, 30 Sep 2013 13:43:57 -0400)
A small group journeyed through a time-gate into Europe's prehistoric past. Yet this supposedly unspoilt sanctuary holds two alien races locked in combat. In a world where the human-like Tanu have the upper hand, Elizabeth Orme soon encounters trouble. When they find she possesses rare mind powers, they want her for their own. She won't be used as a pawn in a Tanu versus Firvulag war, but Aiken Drum can't wait to get involved. Aiken discovers the Tanu's mind-enhancing torcs have given him his own powerful abilities. And it's not long before he devises a plan to challenge the Tanu's leader - for rule of the Many-Coloured Land itself. But another faction seeks the slaughter of all humans, and he stands in their path.
(summary from another edition)
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