Krona: Dragons of Nistala

A gentle dragon, Smooka, is lured deep into a planet-wide cave system, where he takes an epic journey with a princess dragon to her domain, now under a glacier. Deep under that ice, the pair fall in love and discover ancient secrets that foreshadow the coming of humanity. Many dragons have put themselves into a glacial-age hibernation and they will later awaken either to destroy humanity's chances or to be its salvation.