At the end of book one The Oracle of Oblivion is revealed as the kingdom's princess Viena. Viena instantly begins use her pokemon to enslave the minds of the castle guards and soldiers. Cedric, the mentor character who is now revealed as one of the kingdom's finest heroes, tries to fight Viena, but her dark magic fatally wounds him. Jaklo, Kathrin, Mark (a thief boy who was locked up in the castle dungeons), Jaklo's father Trent, and Cedric barely escape. The group finds cover in the forest where Kathrin takes up a sentry position. When she does this some of her Nyff traits/skills are revealed, and later she admits to being part Nyff.
(this is just more spoiler)
Cedric dies and gives Jaklo his Longbow, Kathrin his Falchion, and Mark his cloak.
Cedric's last wish is that Jaklo and the others go gather the Seventeen stars, because (mystic artifacts that contain the seventeen energies which make up the world. they also represent the seventeen types of pokemon.) The Dusk castors (the bad guys) plan to gather them and summmon The Oblivion (the really bad guy).
(its alot of spoiler, but may i remind you nothing is definant.)