By the by, in the Lucius short, the eponymous character isn't sure about how he came back from death in Angel Exterminatus, but we get a heavily implied answer from the author:
I disagree here that Lucius was handled poorly combat-wise just because he got beaten, at last. Nobody is unbeatable, Loken beat Lucius admittedly not with the sword but he did beat him, and Loken's defeat of Lucius in my opinion sums up real combat nicely. There are no niceties and no rules of honour, Lucius is almost unbeatable in formal combat and honour duels but in real war and gutter fighting, Lucius is handicapped by the fact that he doesn't really do that stuff.By contrast, I can't help but feel that this is an attempt to make up for the handling of Lucius in Angel Exterminatus. Frankly, I felt like that was one of the weak points of the novel; it didn't really serve any purpose and it went against the grain of Lucius being this amazing prodigy. So what, now we get a short story that emphasizes what a badass this guy is? We knew that before a half fleshed-out character that featured less than almost any one else in the supporting cast (but happened to be a supreme swordsman as well) cut him down to size.
Those are also some of the reasons why I've never liked Sharrowkyn as a character.By contrast, Sharrowkyn is just that plot device. He has little personality or depth other than the fact that he's a killing machine. He has "unparalleled knowledge of ambush tactics". He's an amazing sniper. He's even better with a sword. He has magical Raven Guard disappearing-reappearing powers. And, worst of all, he's only there to be this badass warrior. That's what sucks about Lucius losing to him. There were a dozen different ways Lucius could have discovered his immortality. Yes, meeting someone who was even better is valid on paper, but the execution was simply poor.
Thank you, I figured it was a plot thread from the Heresy DA books that I have just since forgotten. It has been so damn long since I last read those books... About the only thing I remember from them is El'Johnson passing along the siege tanks to Perturabo lol....Zahariel realizes that the daemon from the end of Fallen Angels - the one he and the Dark Angels following Luther battled - has returned.
This shouldn't be a surprise since Zahariel knew the daemon hadn't been fully banished.