As the Word Bearers' shadow crusade through Ultramar continues, Sor Talgron, one of the last of the Legion to resist the lure of Chaos, starts to fall under the sway of the Dark Gods.

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We all know that the Word Bearers have a dark side... but it turns out the Ultramarines do as well. We won't give away what Guilliman's Legion does to stop the Word Bearers from seizing Perception Primus, but it's almost enough to overshadow the way that Chaos worms itself into the soul of even the staunchly atheist Sol Talgron...