The Dock-based unique unit is the Turtle Ship, an armored and spiked ship which is a heavily armored, short-range artillery ship that is effective against Fire Ships and Demolition Ships. The Castle-based unique unit is the War Wagon, a horse-drawn carriage that is essentially a heavily armored cavalry archer. As a result of their innovation and knowledge of gunpowder (which originated in China, though the Koreans had to develop it separately since the Chinese kept their technologies a closely guarded secret) the Koreans are one of the few civilizations that have two unique units. Being able to successfully defend themselves despite the numerical disadvantages, they are a defensive civilization with a focus on ranged units. This is represented by a Mangonel with higher range granted by their unique technology. One of their most recognized innovations was the Hwacha which fires a series of small bolt like rockets. Also, they utilize a variety of ranged units such as War Wagons, Onagers, and Turtle Ships at sea. They are a defensive civilization using towers. Like their predecessors, they are descendants of the Choson civilization, which inhabited the same peninsula. The Korean civilization is based on Korea during the Joseon Dynasty, which was a dynastic kingdom on the Korean Peninsula that lasted for five centuries. The Koreans are an East Asian civilization introduced in Age of Empires II: The Conquerors. The Koreans' civilization music theme in the Definitive Edition