The final entry in the Monsters of Sin series concerns the sin of wrath - the unthinking destruction of the berserker, only without the focus that makes that useful to barbarians. It's a sin that's directly related to combat, and game mechanically, the concept of berserking and Rage spells covers it well enough already.
The book has 7 pages of content, although the art takes up a lot of that. As always in the series, the art is good quality, and production standards are high. The general discussion of wrath, and the cautionary tale (this time set outside the City of Zobeck, but elsewhere on the same world) take up a couple of pages, and the simple 'creature of wrath' template is pretty much what you'd expect - it's not like there's many other ways of doing it, after all.
The meat, as always, is in the creatures. They range from CR 5 to 23, plus an acquired template that can be applied to anything with at least 2 hit dice (and therefore, will give some low CRs at the bottom end). Considering that the basic theme has to be "it attacks you", which is pretty much what most monsters do, the creatures are rather fun, and effectively embody the sin. One is a harmless fey that becomes deadly when roused, another is an undead fuelled by its internal rage, and a third is your basic rampaging beast. Even the latter has an unusual edge to its abilities, but with all of the three, it's more the descriptions than the stat blocks that do the job of linking the animal to the power of wrath. Which is inevitable, but done quite well.
The exception is the CR23 outsider, which is very much powered by its own rage, so that it actually gets more powerful the longer the fight goes on. Given that it's going to be fairly hard to wipe out something with that level of ability in a single blow at the beginning of the combat (which would really be the best way of doing it) this makes it a particularly effective opponent.
[4 of 5 Stars!]