This is a collection of miscellaneous monstrous tribes. Each tribe has a 2-page description containing Society&Organisation, Ecology&Lair, Combat&Tactics, Notable Personalities, Tribal Lore (Knowledge DCs) and one NPC statblock. The collection contains 24 tribes (mostly 3 from each type of creature). Now this isn’t an NPC codex, this is (as usual for Raging Swan Press) a collection of ideas, the spark that can be used to flesh out a monster tribe. Just to mention a few: a tribe of ogre cooks, undead worg pack, trolls that share their flesh etc. Not all tribes are wellsprings of originality but not one is bland and all have at least one unique detail (if nothing the tribe crests are great).
I wish I had this book, Monster Codex and NecromancersofNW Exotic Encounters when I ran my orc campaign, it would make my job so much easier.
And seriously, you could use Dungeon & Wilderness Dressing, Tribes Most Foul compilation and one of the Village Backdrop compilations and run a whole sandbox campaign out of those four books.
[5 of 5 Stars!]