Myths: A Nostraterra Fantasy Novel - The Fourth Age Shadow Wars, #3

In the distant land of Platonia, ancient protectors of the Gracies are dying; only the Gemwings can restore the magic within the Well of Life. After four Gracies volunteer to search for the Gemwings, Platonia comes under attack. Prince Daerahil lives in exile. Something dangerous is drawing ever closer to him; a shape hunting his soldiers in the shadows of Plaga Erebus, the land of wounded darkness.
Soon, Daerahil will have to decide whether to join forces with this creature, and receive his help in taking back his kingship in return. But will this decision seal the fate of every living soul in Nostraterra?