Balgashang

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A famous sword (most likely a longsword) carried by the paladin Ambertein in the 9th century. Balgashang was unable to kill humans, but could force defeated enemies to make an unbreakable promise. By some, Balgashang is considered an artifact created by Diancecht. Balgashang, which seemed to have quite an edge against orcs, undead and monsters in general, disappeared along with Ambertein in the vicinity of Busenbar around 870.