Rei Ou, a former Great General of Wei and founding member of the elite Seven Fire Dragons—a group equated in prowess to Zhao's Three Great Heavens and Qin's Six Great Generals—possessed a petite frame and distinctly feminine facial features despite being male. He kept his face clean-shaven and wore his long hair in a ponytail. His personality was marked by profound coldness and ruthlessness, traits so formidable they drew wariness even from the late Wei general Go Kei. Fourteen years before the main events, Rei Ou sided with Earl Shi and Gai Mou during a violent internal war among the Seven Fire Dragons, ignited by the killing of Earl Shi's younger sister by Tai Ro Ji. Rei Ou's faction triumphed, eliminating Tai Ro Ji, Ben Tou, and Shou Sen. As punishment for their involvement, Rei Ou, Gai Mou, and Shi Haku endured fourteen years of imprisonment in an underground facility. Following his release, Rei Ou answered the summons of his former student, Go Hou Mei, to defend Wei against Qin in the Choyou Campaign. There, he commanded forces against Qin General Tou. His tactics, combined with Ran Bi Haku's martial strength, forced Tou's retreat. Rei Ou viewed warfare through an ancient philosophical lens, believing its core essence lay in generals killing each other, not territorial conquest. After Qin forces overran the Wei headquarters, Rei Ou analyzed the situation and formulated a counterstrategy: consolidate his troops to strike Tou's exposed army, decapitate Qin's leadership, and reverse the campaign's momentum. This plan was interrupted by the unexpected arrival of Qin Commander Shin. Go Hou Mei deceived Shin into identifying Rei Ou as the Wei commander-in-chief. Seizing this misconception, Shin engaged and slew Rei Ou, abruptly ending the general's resurgence. Renowned tacticians like Ou Ki and Kyou recognized Rei Ou's formidable intellect. He personally mentored Go Hou Mei in military strategy, shaping him into a skilled tactician. Rei Ou's strategic approach emphasized meticulous pre-battle preparation, logistics, terrain mastery, and psychological manipulation. Statistically quantified, he possessed high leadership (90) and intelligence (97) ratings, but notably low physical strength (38). Lacking martial prowess, he relied entirely on the protection of the formidable warrior Ran Bi Haku. His leadership inspired deep loyalty among his troops, evident in their profound shock and anger following his death.