Seraph - The Dawnbringer and the Dusk Bearer (weapon)

The word Sacrifice among those in 4 Corners carries a different meaning to it depending on which religious circle you ask. To those who follow one of the 4 gods of the elements- Ignea, Marus, Aereon, and Teras sacrifice was volunteering to become one of gifted with the god's abilities transforming themselves into something entirely new and otherworldly. For those who worship the Twins, Elios and Lyra, day and night, order and freedom- sacrifice is a holy tenant, something that has been taught and interpreted and carried down for generations of followers of both religions. 
It refers to the voluntary destruction of the Twin's gates in order to provide power to the Net- the magical protective force that keeps many of the fiends in their home of the Abyss. Sacrifice was also what the 15 Solarun and the 7 Nocturum did when they agreed to allow their souls to be encased in a collection of weapons for the people of 4 Corners to carry into battle against Fezzeret the Chaos Beast. 
The weapons, and the souls within, choose their bearer through a process called a Bonding. Stories say that when a prospective bearer tries to bond with a weapon, they pick it up and the soul of the weapon within peers deep into the soul of the person to ensure that their very essences are perfectly aligned with one another. If they are, the weapon speaks to the bearer for the first time. If not, then the weapon will damage the prospective bearer; the light weapons will burn with the heat of the surface of the sun; the night weapons will poison an unsuccessful holder and a healer is necessary to sap it out in time. Those who are successful become Scarlet Knights for Elios and Shadows for Lyra. When a successful bonding has occurred each order has its own ceremonies associated with it as well. 
No weapon was more discriminating and judicious than the first weapon ever created on the island of the Forge, Seraph - The Dawnbringer, and the Dusk Bearer. This two-hander greatsword is over five feet in length, just shy of 7 pounds in weight, and bears the shape of her people's house upon the pommel. The blade itself is etched with the symbology of Justice along the blade, and the soul within was not simply a ruler of her land. She was Elios' closest confidant, and she had ascended to demigod status and rallied the other 14 souls to willingly sacrifice themselves to become the other weapons for 4 Corners. In the sun, the blade is said to shine and glow golden as if still hot from the forge with the engraved insignia a vibrant and pure white. The grip is a deep, scarlet red said to represent the color of Seraph's kingdom in her homeland, and the color of the capes that all the knights wear. 
The bearer of Seraph not only needs to have the strength and training to properly wield her but also have a mind and soul for justice and leadership just as the demigoddess had in her body-and-soul life. For two millennia, the bearer of Seraph is long considered the unofficial leader among the Scarlet Knights, a pathfinder, an one who sets the tone and morale for the rest of Order. However, over the course of the centuries, only 10 people were every worthy enough to bear Seraph. While there were a number of centuries where she had gone missing, the story goes that she only ever returns to the shores of The Forge when a soul out there is worthy enough to bear her. 
Currently, in the era of the War of 4 Corners, the bearer of Seraph is known as Argos. He also mysteriously washed up onto the shores of the Forge as a boy, and rumors say that he was able to speak with her before ever receiving any training. No other knight will admit to such a story, however. Simply rumors.