Dark Creed is the third book in the Word Bearers trilogy, written by Anthony Reynolds, and published in 2010.
Dark Apostle Marduk faces challenges from within his own Legion as he wages war with the White Consuls Space Marine Chapter. Harnessing the power of the Nexus Arrangement, a powerful necron device, Marduk can turn the tide in the Word Bearers' favour. But just as the White Consuls are on the verge of defeat, an old enemy returns to throw the entire dark crusade into ruin. If Marduk is to survive and fulfil his ambition, he must defy an onslaught from the necrons, the White Consuls, and his own Legion.