Inheritance Trilogy Series by Ian Douglas

Planet by planet, galaxy by galaxy, the inhabited universe has fallen to the alien Xul.Now only one obstacle stands between them and total domination: the warriors of a resilient race the world-devourers nearly annihilated centuries ago . . .A power vast, ancient, and terrifying, the mighty Xul have lost track of the insignificant humans hundreds of years after devastating their home world—which has enabled the United Star Marines to operate unnoticed and unhindered... morePlanet by planet, galaxy by galaxy, the inhabited universe has fallen to the alien Xul.Now only one obstacle stands between them and total domination: the warriors of a resilient race the world-devourers nearly annihilated centuries ago . . .A power vast, ancient, and terrifying, the mighty Xul have lost track of the insignificant humans hundreds of years after devastating their home world—which has enabled the United Star Marines to operate unnoticed and unhindered. A near-autonomous intergalactic policing force, they battle in defense of an Earth they may not live to see again. Now, following the trail of a vanished twenty-fourth-century transport, they are journeying through an unexplored stargate to the edge of an unknown galaxy many light years from their sun. For the last, best, and only chance to defeat the tyrants of the universe may at long last be at hand . . . less

War is foreverThe people on Earth no longer remember how the human race was nearly obliterated centuries earlier during the terror visited upon them by the merciless Xul. But the Star Marines, thirty thousand light years from home, know all too well the horror that still lives.In the year 2886, in the midst of the intergalactic war that has been raging nonstop for nearly a decade, the unthinkable has occurred... moreWar is foreverThe people on Earth no longer remember how the human race was nearly obliterated centuries earlier during the terror visited upon them by the merciless Xul. But the Star Marines, thirty thousand light years from home, know all too well the horror that still lives.In the year 2886, in the midst of the intergalactic war that has been raging nonstop for nearly a decade, the unthinkable has occurred. Intelligence has located the gargantuan hidden homeworld of humankind's dedicated foe, the brutal, unstoppable Xul. The time has come for the courageous men and women of the 1st Marine Interstellar Expeditionary Force to strike the killing blow. But misguided politics on an Earth that no longer supports their mission could prove the Marine's greatest enemy—as they plunge bravely into the maelstrom of conflict . . . and into the heart of a million-year-old mystery. less

The final conflictChaos has erupted throughout the known galaxy, threatening countless colonies and orbital habitats—as the Associative struggles vainly to keep the peace. Extreme measures are called for in these times of dire crisis, and the Star Marines are awakened from their voluntary 850-year cybe-hibe sleep. But General Trevor Garroway and his warriors are about to discover that the old rules of engagement have drastically changed . . moreThe final conflictChaos has erupted throughout the known galaxy, threatening countless colonies and orbital habitats—as the Associative struggles vainly to keep the peace. Extreme measures are called for in these times of dire crisis, and the Star Marines are awakened from their voluntary 850-year cybe-hibe sleep. But General Trevor Garroway and his warriors are about to discover that the old rules of engagement have drastically changed . . .The end begins with an old-style assault on rebels at the Tarantula Stargate. But true terror looms at the edges of known reality. Humankind's eternal enemy—the brutal, unstoppable Xul—approaches, wielding a weapon monstrous beyond imagining. Suddenly not only is the future in jeopardy, but the past is as well—and if the Marines fail to eliminate their relentless xenophobic foe once and for all, the Great Annihilator will obliterate every last trace of human existence. less