Harpoons

 is a ship statistic added by certain weapons. It allows the use of Flensing Salvo in combat.

Flensing Salvo deals extra damage to Zee-monsters and Crew, and minimal Hull damage. It only increases the user's Illumination by 5. It is otherwise identical to Salvo, and does not consume any type of ammunition.

Obtaining
In order to have  you must buy the following Ship equipment in London:
 * Caminus Yards Heart-Ender at Caminus Yards
 * Leadbeater & Stainrod 'Britomart' Flensing-Cannon at Carrow's Naval Surplus
 * Stampshod's 'Calvary' Prong Launcher at Carrow's Naval Surplus