Heroes of the Ashford Valley (MicrOSR20)
Bugbear Longswords are considered masterwork weapons in the Ashford Valley. Unfortunately, the only way to get one is to kill a bugbear, often a difficult feat.
They deliver more damage than regular longswords, inflicting 1d8+1 damage.
A company in Tradetown called the Iron Bugbear Sword Company is reputed to make authentic bugbear longswords but the company is mysterious and few know where in Tradetown it is located. How they have learned this secret forging technique is just another mystery.