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In Dark Creed there's The Warmonger's Heroic Sacrifice where he manages to temporarily destroy the Undying One's body. (He gets better, but with a name like The Undying One, what did you expect?) Even better is that for the first time in the series we read it from his perspective and see that the Warmonger thinks he's killing the God-Damned (pun intended) EMPEROR OF MANKIND, giving a nice sense of closure for the character.
Every time the Ordinatus is fired in Dark Apostle.