Kingdom of the Serpent, book 3: Destroyer of Worlds
Mark Chadbourn2009

It is the beginning of the end ...The end of the axe-age, the sword-age, leading to the passing of gods and men from the universe. As all the ancient prophecies fall into place, the final battle rages, on Earth, across Faerie, and into the land of the dead. Jack Churchill, Champion of Existence, must lead the Brothers and Sisters of Dragons in a last, desperate assault on the Fortress of the Enemy, to confront the ultimate incarnation of destruction: the Burning Man. It is humanity's only chance to avert the coming extinction. At his back is an army of gods culled from the world's great mythologies - Greek, Norse, Chinese, Aztec, and more. But will even that be enough? Driven to the brink by betrayal, sacrifice and death, his allies fear Jack may instead bring about the very devastation he is trying to prevent ...