Author’s notes: this sub borrows heavily from actual Chinese history and folklore (at least, so far as the legend section goes but a fair bit was just the author adapting real history to her own use).
It is a set of two short swords (housed within the same scabbard) that weigh approximately the same but one (the female sword) is shorter than the other (the male sword) by a few Chinese inches*. Neither of these swords are ornately decorated but to a trained eye they show superb craftsmanship.
*The male sword is about 0.9m long in modern terms while the female one is about 0.8m in length
The Shuang Gu Jian is well-known as the weapon of Liu Bei, lord of the Shu Kingdom during the Period of the Three Kingdoms. The story of its crafting is not really known except for the speculation that it was crafted by a local smith as a special gift to Liu Bei for freeing the region Han Zhong from the rule of the villainous Cao Cao, lord of the Wei Kingdom. It was recently put forth as a theory that this set of weapons was actually the long lost set of swords Gan Jiang and Mo Xie crafted by and named after the famous swordsmith couple in the era of the Spring and Autumn Warring States and somehow recovered by Liu Bei. Neither version could be proved (or for that matter disproved) since this legendary set of swords had long been lost.
After Liu Bei passed away, the Shuang Gu Sword went to his eldest son and successor Liu Shan. Later when Liu Shan surrendered to the Wei court, he gifted the weapon to Cao Cao as a tribute. It was said that this greatly pleased Cao Cao, who subsequently kept the weapon of his strongest opponent lovingly among his personal collection of trophies.
Upon his succession, Cao Pi- surviving eldest son of Cao Cao, attempted to kill his younger brother Cao Zhi, who had been his chief rival in terms of contending to be the crown prince. The sequence of events from this attempt that culminated in the forming of the Seven-steps Verse is already well-known. In addition, one text recorded (via oblique references) that after this unsuccessful attempt, Cao Pi gifted the Shuang Gu Sword to Cao Zhi. It was conjectured that such an action was done in mockery on the part of Cao Pi, using their father and his chief rival as analogies for himself and his younger brother respectively.
And from this point on, the whereabouts of the Shuang Gu Sword passed out of official records but periodically, rumours would surface of an extraordinary pair of swords that is similar to the Shuang Gu Sword. In each of these tales, this pair of swords confers a totally different yet similarly spectacular ability to its owner.
Amongst them, the most dramatic relates to that of the legendary Xue Cheng Yue in the era known as the Northern Song period, the leader of the rebels in the Northern part of the Dragon Empire that was held by the Jurchen invaders at that time (who adopted this particular name to declare his intentions of taking over the mantle of responsibility for repelling the Jurchen invaders from the patriotic general Yue Fei). However, it is hard to ascertain whether Xue Cheng Yue was an actual person that existed or merely a mythical figure that came about from the populace’s laments over the demise of the tragic hero Yue Fei at the hands of the villain Qin Hui. Consequently, there are two schools of thoughts divided on their belief regarding the authenticity of the ‘subsequent sightings’ of the Shuang Gu Sword. One firmly believes that the Shuang Gu Sword did surface from time to time and moreover that it is one of the remarkable weapons made from wishsteel that allowed it to adapt its properties to its owner. Meanwhile, the other stream maintains that these other weapons were in all probability simply replicas. As for the reported special properties, it was thought that they were merely embellishments that were wont to occur in these local legend/folklore type stories.
According to the Romance of the Three Kingdoms, the Shuang Gu Sword is a loyal weapon, much as its master Liu Bei. Allegedly, it would fly out of the grasp of Cao Cao of its own accord whenever he attempted to hold either of the blades in his hands. Nothing so dramatic was mentioned when this weapon was in possession of either Liu Shan or Cao Zhi. This was taken to be a sign that the Shuang Gu Sword did not find either worthwhile masters for itself even though they were not as repellent to the sword as the most heated foe of its rightful master.
Of the ‘subsequent sightings’ of the Shuang Gu Sword, most accounts did not delve into exactly what the special boons this legendary weapon gave to their owners. Where a property was mentioned, different versions arose. For example, in the Northern part of the Dragon Empire, it was passed down in legends that Xue Chen Yue held a set of blades that were bloodthirsty- it was said that the more blood they were fed, the more voracious their appetites grew, such that they would seek out bodies to cut down of their own accords. In the Southern, though, most believe that either he wielded a pair of swords that gave him the ability to make his troops invisible or move like the wind in combat.