King Geunchogo of Baekjes' Sword

Origin
Geunchogo of Baekje (324 - 375) was the 13th king of Baekje, one of the Three Kingdoms of Korea. Under Geunchogo the kingdom reached its greatest geographic extent and political power. During his reign, Baekje activated and led the commercial trading among China, Korean Peninsula and Japan; known as the triangle trade. Traditionally the commerce was mostly dominated by Chinese emperors, however during ocean battles China lost control of it all. Especially when northern China came under the rule of the Foreign People who were inexperienced at sea.

Effects
Possessor gains uncanny sailing prowess.