Golden Ones

Contact with The Golden Ones at the ancient outpost called Sanctuary changes everything, but it also brings a terrifying new problem. A warfaring race that knows no reason and no mercy is closing in on coalition space, and the two civilisations on Challi are catapulted into a race to be ready for the enemy's arrival.The author's previous trilogy (the Navscar Trilogy) has GOODREADS ratings of 4.3 (33 reviews), 4.4 and 4.6.A huge, sprawling epic with 125 thousand words per book.