A Darkness Returns - Raymond E. Feist

As worlds collide… Hatushaly, last scion of the Firemane dynasty, his beloved Hava, and their dubious friend Donte have been transported across space and time from the war-torn world of Garn to the relative peace of Midkemia. There, on Sorcerer's Isle, under the guidance of the magician Magnus and his erstwhile father Pug, in his reincarnated form, Hatu will explore and expand his unique magical abilities. With the evil Pride Lords defeated, the Church of the One has risen to bring death and destruction to his home world. The Church is sending forces against Marquensas, where Daylon is now king, and Declan Smith finds himself suddenly and unexpectedly raised to the status of prince and war commander. But an even greater menace than the Church of the One lies in wait, a creature from the Void, bent on the destruction of all living things. Pug, Nakor and Magnus will need to join forces with Hatu, Hava and Declan if they are to save the worlds of Midkemia and Garn from everlasting darkness…