From the back cover:
High Noon. The hot desert sun shines down on two gunslingers. Sweat drips from one's brow. From the other - nothing. His pallid flesh no longer sweats.
The gunmen draw, slinging lead like bolts of lightning. When the smoke clears, both men are hit, but one remains standing.
Welcome to the Weird Wild Western world of Deadlands, a roleplaying game of Western Horror! This all new version of the award-winning, best-selling Deadlands: The Weird West brings to unlife all the fast action of the original using the d20 system.
Inside are the rules for playing gunslingers, Indian braves, shamans, mavericks, rowdies and more. There's also a passel of new spells, steampunk devices, relics, prestige classes and a Weird Western bestiary of strange and horrible creatures like the wendigo and the awesome Hangin' Judge! A few unfortunates might also find their story doesn't end at Boot Hill.
This book contains everything you need to play in the world of Deadlands or any other Western setting using the d20 rules.