* CompleteMonster: Vicar Zhaspahr Clyntahn is Grand Inquisitor of a CorruptChurch, which tells you all you need to know. However in the fourth book, he not only executes every vicar in the Church who even thought about opposing him, but their families as well, including [[WouldHurtAChild children as young as twelve]]. This act is monstrous enough that a declaration of Holy War that had been hanging over the plot since the second book is rendered an ''afterthought.''
* MagnificentBastard: Subverted; Kahlvyn, Duke of Tirian shows every sign of being one, but is then killed off very quickly.
* MoralEventHorizon: The Ferayd Massacre and (in the eyes of Church Loyalists) the Charisian response to it.
** Clyntahn's treatment of anyone even remotely associated with the Wylsynns is this for Duchairn, who comes to view voting for the invasion of Charis as his own.
** It takes a ''lot'' to turn a declaration of Holy War into an afterthought. Clyntahn pulls it off.
*** ''How Firm A Foundation'' also shows that this has become an InUniverse Moral Event Horizon, as it cements Clyntahn's status as a complete monster to anyone who isn't plain ignorant or as fanatical as Clyntahn himself.
* ProtectionFromEditors: The books are quite long and could use a little tightening. One example would be the jargon-laden, plodding opening chapter of ''How Firm A Foundation'' which is about a ship getting fighting to avoid running aground in a storm; it really contributes nothing to the plot, though it revisits two minor side characters and [[AuthorAppeal shows off Weber's knowledge of sailing]].
** The later books also show spelling errors, characters called by one name when the narrative clearly means another, occasional confusion between Charis, Chisholm, and Corisande and a changing in the name of Hektor Aplyn-Ahrmahk's duchy from Darcos to Darcos Sound.
** The first ''five'' books contain the story that Weber had originally planned for book one. He's openly stated that he's deliberately dragging things out to put his kids through college.
* RecycledScript: The overall premise of the series (Musket-era FeudalFuture, PathOfInspiration repressing technology, etc.) was previously used as one major plot-thread of the third book of Literature/EmpireFromTheAshes, and the concept of a race of genocidal aliens intent on wiping out all other sentient life was first used in the series as a whole.
** Shades of this same concept are seen in the war between Grayson and Masada (SpaceAmish religious fanatics whose war went nuclear). Humanity's SpaceNavy, seen briefly in the Safehold series, strongly resembles the navies of ''Literature/HonorHarrington''. The tossed salad genetics and wildly diverse names were ''also'' seen in Honor's world. Indeed, it seems almost every idea hatched in the Literature/{{Safehold}} universe was incubated in one of his other series. [[TropesAreNotBad Not that that's a bad thing]].
* WarShip: Cayleb & Sharleyan, given they started out as (albeit reluctant) enemies.