Shovel Knight: Plague of Shadows is a free expansion for Shovel Knight, You play as Plague Knight, the villainous master of alchemy, in a quest all his own.Shovel Knight: Plague of Shadows is a free expansion for Shovel Knight, You play as Plague Knight, the villainous master of alchemy, in a quest all his own.Shovel Knight: Plague of Shadows is a free expansion for Shovel Knight, You play as Plague Knight, the villainous master of alchemy, in a quest all his own.