Taken from the item listing, since it is more than just a mere item.
The sword sat on a rack in a blacksmith's shop, newly forged ad ready to be bought. A handle of twisted and texured steel, measuring a foot and a half long, a handguard at the start of the blade, and a four and a half feet double sided steel blade, polished.
Soon after it was put up, an assassin came in dressed as a common soldier. He bought the great sword, and left.
The assassin faded the polish by corroding the blade with acids, and he hammered off the hand guard, so that it were a handle and a blade. He marked the pommel with an hourglass, one side scratched full, the other side left empty. Around it was a triangle. From then he used it as his weapon.
He dressed as a jester on stilts, and his the blade along his side and down the stilt before leaping from the stilts and coming down with a fatal blow on the duke, slicing the man in two, from the left shoulder down to his mid side.
He peddled a long tray of food at a gathering for a party for the earl, thrown by the viscount. When he served them, having a charming smile and seducing them, he "accidentally" dropped a fruit, and when he came up he stabbed the sword through the earl, then yanked it out before turning and throwing it, spearing it through the viscount's back. The guards nearly took him before he could get the sword out of the corpse, but he fled.
The king was having a parade, and as his chariot drove by, the assassin leapt and sliced through one pillar holding up the chariot's roof, and sliced right into the king's chest, and through half of the queen. He yanked and tugged, and the pulling of the horses helped, but he got the sword. He fled, but the guards followed him.
The captain went after him, and took three knights with him, sending the rest of the guard to block off all escapes. When the knights guarding the exits got tired of waiting, they went to see what had happened. One guard was hung upside down in a trap, and one was crushed by an anvil, dropped from atop the blacksmith's roof. The third was cut through the neck, and there was a market stand crushed, seemingly from the fall of someone jumping from the roof. The captain, was missing half a leg, and half an arm, and was impaled through the shoulder against a wooden door, his corpse standing against it. It took three knights to pry the sword from the depth it was impaled into the door, and they figured why the assassin hadn't taken it.
The kingdom fell to shambles, as the population left, going to neighboring nations. In one they held an auction, for "The sword that slayed an empire." It sold for two thousand gold coins, to a rich nobleman. It's legitimaticy was proven by the mark on the bottom, which the public wasn't let known about, so it couldn't be duplicated.
He kept it until the Duke who had the kingdom slaughtered had that same very assassin, steal the sword. He only met a guard dog, which he got rid of with a nice slab of steak.
The assassin retired, and the Duke kept the sword, until they found him out and had him executed. On hearing this, the recently retired assassin went into he confines of the blocked off mansion and took the sword.
He took it to his favorite spot when he was a kid. He was only in his mid twenties but had enough money not to have to be in the business of thieving and killing anymore. He took the sword to a little creek, with a rope hanging on a branch to swing from. He remembered playing there when he was a kid, and tossed the sword into the creek, wondering if any venturous kids would find it. He rode off with a smile...