Shovel Knight: Plague of Shadows is a free expansion for Shovel Knight that follows Plague Knight in his own quest. He uses alchemy to search for ingredients needed to create Serum Supernus, but the items must be extracted from the villainous knights of the Order of No Quarter. The expansion reintroduces the series’ platforming, music, and storytelling while adding a new play style, new bosses, and additional story content.