The golden torc

By 2110 AD, nearly 100,000 humans escaped the Galactic Milieu's strictures, seeking freedom in six million BC Earth via a one-way time tunnel. However, they fell into the hands of the Tanu, a humanoid race exiled for their barbarous ways. The humans inadvertently strengthened the Tanu, giving them an advantage over their rivals, the Firvulag, and threatening Tanu supremacy.