The Morning of the World — Roger LeLoup

There is a volcano in Bali, the Agung, called The Morning of the World by the locals. And that's where Yoko meets up with her cousin Monya-who couldn't resist the temptation to use her time machine again. Her meddling with the past has caused a sacred dancer to be sentenced to death. To save the young woman and make things right, Yoko will have to travel back to 1350 AD and face the te rrifying flying demons of the Agung...