Flight Of The Nighthawks: Raymond E. Feist

Book I of Darkwar. The Conclave of Shadows faces two challenges: finding and destroying the evil magician Leso Varen and deactivating an army of sinister magical warriors hidden in a cave on Midkemia. These warriors are beacons for a cast army of alien invaders, so formidable that even the combined might of Midkemia and the Tsurani Empire could fall before its power. Cover art by Dominic Forbes.