http://www.pcgamer.com/the-shieldbreaker-joins-darkest-dungeon-later-this-week/

A new hero class called the Shieldbreaker will arrive in Darkest Dungeon later this week, and like her fellow digital dungeoneers she is a formidable but deeply flawed adventurer: "Deadly as a viper, her iron will has been forged in the heat of the blazing desert sun. Though outwardly demure, her emancipation from the barren wastes came at a price so terrible, it haunts her dreams even now." 

The Shieldbreaker brings new combat mechanics to the fight including Armor Piercing, Guard Break, and Stealth, and also has class-specific trinkets. She's "a highly tactical hero with solid damage-dealing capability," who "excels when countering monsters with high protection and those who guard their allies."