The Primus Initiative - The Specimen Chronicles

A war that began twenty years ago has arrived at last, and humanity will join the fight to save five civilizations from extinction. After a twenty-year journey across space, the mysterious and dreaded Namadi fire ships are arriving. Their mission to destroy five civilizations will cost the lives of billions across the galactic sector if the ships can't be stopped in time. The only hope to defeat them hinges on the success of a daring operation.
  In a desperate race against time, Darrien Norris and Onallin Rantara must lead a team of commandos to a remote world in search of crucial information to destroy their enemy. The Namadi are drawing closer and where their foe is scheduled to emerge is the most prized secret in galactic history-one they are prepared to kill for. With surprises waiting at every corner, Darrien and Onallin have no choice but to trust new allies before it's too late. Time is against them, and the race for survival has begun.