Fallout: New Vegas creator Obsidian has revealed the first details of Xbox 360-exclusive add-on Dead Money.
It's set in the Sierra Madre, a casino that froze in time following the nuclear war that precedes the Fallout videogames, senior designer Chris Avellone revealed in the Bethesda Newsletter.
"The Sierra Madre faded from the history books, only occasionally being seen in posters across the wastes, until it took on mythic ghost story status... a supposed 'City of Gold' in the Mojave Wasteland where all the treasures of the Old World were rumoured to be held," Avellone said.
"It was kept alive as a late-night saloon story by prospectors who'd claimed to have found maps leading there... and were willing to part with the 'map' for a few caps. Or a drink. Or a warm place to sleep."
Father Elijah of the Brotherhood of Steel set off to unearth its secrets, and the Courier follows in his footsteps after detecting a radio broadcast advertising the Sierra Madre gala grand opening.
There the Courier will meet a mysterious group called the Ghost People. There's a solitary screenshot of the mazmat suit-wearing creeps below.
Once downloaded, the add-on will pop up as a radio broadcast after a save file is loaded from any point in the game prior to the endgame sequence.
Obsidian's Fallout: New Vegas launched last month. Dan Whitehead awarded the post-apocalyptic open world role-player a stonking 9/10.