Valyrian Weapons
Valyrian weapons are unique weapons to the game which do not break but are difficult to acquire. They are also able to damage whitewalkers and wights.
1 or 2 handed Valyrian sword
A valyrian sword can be acquired from the weapons merchant in Qohor. But you will need a value of 3 or higher in town reputation for the option to buy it.
The merchant can make a total of two of one handed weapon or one of two handed weapon. They cost 90,000 or 120,000 each respectively.
Enhancing the valyrian sword will result in a masterwork version which is visually different from the normal grade.