Two longswords spring to mind if you can take them from some very tough Drow.
1. Complete the Proving grounds as a fighter type class and get the longsword of chilling speed
2. As Part of this you should have defeated the Drow Champion Fighter and taken his Drow Longsword + 9.
If you see me online as Barbag then he has almost every sword in the game so he could help you out.
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