The Ashes of Worlds (Saga of the Seven Suns 7) (Paperback) by Anderson Kevin J.
The allied factions of humanity along with the waning Ildiran Empire the powerful water elementals and sentient trees have defeated the near-invincible race of the hydrogues driving them back into the depths of gas-giant planets. But before peace can heal the wounds between the races two ancient enemies return: the capricious fiery elementals the faeros who mean to burn all those who fought alongside their enemies; and the lost hive race of the Klikiss who intend to reclaim the worlds they inhabited 10000 years earlier worlds that are now home to many human colonies. Meanwhile the leader of the Terran Hanseatic League Chairman Basil Wenceslas intends to pull all of humanity's unruly stepchildren into his iron grip -- even if it means he has to hold the Ildiran Mage-Imperator hostage risking renewed war with an entire alien civilization. Thus the myriad storylines of galactic warfare and personal betrayals starlost romances and titanic alien conflicts are brought to a thrilling conclusion.