From GW's site:
Altar of War
Battle in the 41st millennium is a bloody affair with conflicts raging across the galaxy. Every opponent represents a new challenge and each army has their own battle tactics. On the battlefield, you have hundreds, if not thousands, of different ways you can play games of Warhammer 40,000.
The Altar of War compendium is a collection of 63 missions (that first appeared in digital products) presented in a handy hardback book.
The missions encapsulate all the methods of war being fought across the Imperium and beyond. Each one is tailored to the specialist tactics and unique weaponry of many of the factions fighting in the 41st Millennium - from the rapid shock assaults of the Space Marines to the insidious incursions of the daemonic legions. Each mission is designed to challenge your tactical ability and this book features the Altar of War missions from:
- Space Marines, including Sentinels of Terra and Clan Raukaan
- Dark Angels
- Imperial Knights
- Eldar, including lyanden
- Tau Empire, including Farsight Enclaves
- Chaos Daemons
- Chaos Space Marines, including Black Legion.
I already have a number of these, but not all of them so I'm kind of tempted to pick this up.