Revision of battle characteristics such as projectile range, hitting power, reload time, and armor penetration to be more realistic.
Campaign AI has been improved.
Additional historical scripted events.
Significantly revised religious system.
Revises all campaigns, including DLCs. The revised campaigns are: Grand Campaign 272 BC, Secundo Triumviratus, De Bello Gallico, Secundum Bellum Punicum, Archidamian War.
More than 50 factions now playable in Grand Campaign.
Description: Focuses on realism and historicity, redefines almost every area of the game. The CAC Manual is 172 pages long!
There is a helpful knowledge base on the CAC, see the first post for information on what exactly changed, what is listed above is only a small portion of what has changed.