Morvenn Vahl: Spear of Faith is hamstrung by its genre and setting, turning it from what could have been a journey of self discovery and overcoming ones faults to grow into leadership when it is demanded of them, into something more akin to a good early 2000s action movie. It's not bad, but the potential so visibly left on the table leaves a bittersweet taste in the mouth.
Morvenn Vahl is the primary and titular character, the head of the Adeptus Sororitas - an order of futuristic battle nuns. If you're new to this setting, stop here. This book is not an introduction to the world of Warhammer - it is instead deep in the mythos already, and takes no time bothering to get you up to speed with the state of things. Instead of painting a clear picture of the general setting, it paints one of Vahl. A brash woman that is unsure of herself, quick to temper, and lacking in subtlety in both the arts of politics and war. When called to defend an important and holy world, she's forced to contend with both an enemy more cunning than her, and her own self doubt in order to win the day.
The most fun to be had is in the front to back action. The fights are well described and visceral, if tending towards long winded in moments. Jude Reid is excellent at setting the scene and especially at making the enemy a real threat. In addition, time is spent early on to remind you that the protagonists aren't necessarily the good guys - as they support incredibly awful practices that may see you silently hoping neither force makes it out alive. But when they clash she makes sure it is a spectacle that utilises much of the settings most enjoyable elements.
The issues tend to turn their heads when it comes to the characters. The primary cast sees far less development than one would think - and this is mostly noticeable in Vahl. Throughout the book, Vahl makes fairly boneheaded tactical choices. She angers allies, runs headfirst into battle, and does little to truly try to understand her much more tactically minded foe. She's confronted on this, her self doubt, and her faith throughout - and though her self doubt and faith reach a modestly reasonable conclusion - her ability falls flat. She does make some choices near the end of the book that let be a more levelheaded commander, but this is still a warhammer action novel. She must duel the big monsters, and fight the big bad guy alone. Even if it means abandoning that part of the character arc to do it.
She's not the only one to suffer in this regard. The supporting cast do not get the time you'd want. A lot of Vahls issues are internal, and being a stoic general means facing them alone. The other primary perspective of a slave freed by the Night Lords and taken in by their leader is also missing a strong supporting cast. The evil, murdering, space marines are fun and their petty squabbles are handled well enough, but much of the book lacks the build up of its cast in order to facilitate the action.
This isn't to say this is a Do Not Read. If you're interested in either the sisters of battle, the Night lords, or enjoy the setting than this is a perfectly fine, easy read. Though not the settings best, Spear of Faith manages to be enjoyable front to back.