Tome of Corruption is an in-depth look at Chaos in the Warhammer fantasy world, much like Realms of Sorcery was for magic. There’s a lot here, and it’s mostly very good – it’s close to a “must-have” if you intend to seriously use Chaos in your game (at least in any nuanced form). It’s a big book: even though 256 pages doesn’t sound like much, the smallish font and full layout used in this game line means it’s quite a hefty tome, information-wise.
The book explores Chaos from many directions. We’re given descriptions about the various types of typical Chaos worshipers and how they differ from each other, and also on how their cults differ in their aims and behavior. There’s a huge list of expanded mutations, for extra fun in inflicting your PCs with new… features. We get a pile of new Chaos equipment, most of it in the “unique artifact” category. In general, the first part of the book concentrates on general description of Chaos workings within the Empire, including the old “why would anyone want to serve Chaos in the first place?”.
The second part takes a look at various Chaos-related beasts, monsters and peoples, including information on how to play one as a PC. Also included is some info on Witch Hunters and other enemies of Chaos. The third part moves the viewpoint North, to examine the faux-Viking Norsca and the northern Chaos Wastes. Lots of adventure potential here, it’s a nasty and lethal place, filled with nasty and lethal people and monsters.
The book winds down with an examination of the major Ruinous Powers and their (very different) goals, along with Chaos Sorcery and the armies of Chaos.
It’s a great book, and does for Chaos much what Realms of Sorcery did for magic: expands and enhances it for game use. Without the background here, it’s all too easy to portray Chaos as mindless destruction and corruption for the sake of corruption. While it can be that, there are also lots of other options, some quite subtle.