Harvest

Harvest is the ancestral sword of House Darry, made of Valyrian steel. It is a bastard (hand and a half) sword made of the metal which has been owned by the family intermittently for over a thousand years. Its current owner is Lady Amerei Darry, but her husband Ser Clement Hayford is its current wielder.

Meta
(yup, the only house in the Riverlands in AWOIAFRP with a VS sword is House Darry of all people)

Harvest was one of 18 entries to AWOIAFRP 3.1's Valyrian Steel Writing Competition, being selected by the moderation team as their winner after failing to accrue enough support to win the popular vote. The full entry can be found here. 

Description
Harvest is a Valyrian steel sword, constructed for House Darry during the 740's BC. The sword is a bastard sword, with a straight and uncarved blade designed not for any kind of finery; the very sword itself is enough, the only one known in the Riverlands. The grey rippled blade was forged for one purpose, that purpose being to kill any and all who oppose the Darry holding the weapon. The pommel is also a circle of Valyrian steel with a small lead core to provide the proper balance with the lighter metal.

The grip itself does not contain the jewels and precious metals of other swords. It is plain even for an older sword, with a grip made of the softest leather, the grip shaped to fit the current owner's hand and changed for a new one upon their death. The blade is light enough due to its metal to be held in one hand by even a half-decent warrior, while it can be used in two hands even by minors or women.

Creation (740's-739 BC)
In 749 BC, House Darry was at the zenith of its power. Considered one of House Teague's most loyal followers they had been richly rewarded, allowing them to construct their first stone castle and for a small town to establish itself around their castle. With such an opportunity never likely to come again, Lord Addam Darry sent three hundred loyal men and half the Darry treasury to the topless towers of Valyria, to bring back what at the time would have been one of only a couple dozen in Westeros; a sword made of Valyrian steel.

The sword itself would be a plain version of the sword; even with all the money they could spare in order to get a sword fulfilling their lord's requirements on size the sword had to have no ornament, without even a jewel in the hilt. This problem however would turn to be a blessing in disguise, as the group returned from Valyria with less than a third of their original group from deaths and desertions.

The plainness of the sword made it easy to hide, with it appearing just like any other until taken out of its scabbard. It made the sword even lighter, enabling a trained fighter to dance through his enemies with a speed that a heavier, more ornamented sword could not hope to match and making it far easier for a weaker lord or lady to use the sword effectively. It also made the sword faster to produce, the dragonlords producing the sword in a little under a decade.

A Sword Lost (739 BC - 282 AC)
Upon its return Lord Addam would die and it would pass to his daughter, the Lady Bellena. As time passed and wars became more frequent with the stormlords and later ironborn the sword proved its mettle time and time again, doing the best it could to defend Darry from its assailants even if that was often an impossible task. Frequently the lord was a minor or the male line was extinguished entirely, and thanks to the foresight of its makers Harvest was still able to be used under dire circumstances by these rulers with great efficiency.