[Bozos of Bones]

IIRC, it deals 1d6 acid. But a mod buffs it up to 3d6 and some other. Before EoU Bastard Sword Rebalancing the bastard swords were OK, but always weaker than other blades available at a given time. Now, they're overpowered. It should appear in teh Jungle Temple, not in the Targos store however. A few merchant mods add some items from teh game to Targos and Kulduhar stores.