The Workmen's Annex is characterized by its industrial ruins and the presence of Wallflowers, stationary enemies that shoot projectiles. They are often placed in strategic locations, forcing you to use cover or quickly close the distance. You'll also encounter Grapplers, enemies that can pull you towards them, making them dangerous in conjunction with other foes.
Keep an eye out for environmental traps and collapsing platforms. The path will lead you through several combat encounters, testing your ability to manage multiple enemy types simultaneously. Consider using a weapon like the Dueling Pistols for quick, precise shots against Wallflowers, or the Brusher's Pike for its reach against Grapplers.