Steam now features the Nomadic Tribes Culture Pack for Total War: ROME II, and while this will carry a full US$7.99 price tag, it is being offered for free to owners of the game between now and October 29th. "We’ve had more gamers playing ROME II, and for longer, in its first month than any other Total War to date. We are going to continue to work on gameplay feature balancing with our community who have been hugely helpful in feeding back on the game," says Mike Simpson of Creative Assembly. "Offering this DLC for free for the first week it’s on sale is a celebration and a small thank you to them for helping us make this the biggest TW yet." Here's a trailer, and here's word on the contents of the pack:

The Nomadic Tribes favor cavalry, exclusively in some cases, providing for swift hit and run and massed shattering charge tactics on the battlefield. The three playable factions come with new buildings and building chains, technology tree, campaign objectives and new units both unique and for general mercenary use.