Today Sega released Warpath Campaign, the digital expansion to Empire: Total War. If you don't already have the base game, Steam's got a tempting new offer to celebrate Warpath's launch.

For the rest of the week, purchasing Empire: Total War through Steam will cost merely $25 instead of $50. The discount applies to separate purchases of the game as well as the Total War Mega Pack, a bundle containing Empire, Medieval II: Total War, and Rome: Total War. Warpath Campaign costs $10 so you'll still be fifteen bucks ahead if you buy it along with Empire this week.

Warpath adds five Native American factions with access to new units and technologies. It also includes a new campaign and an expanded North America map.