Butterfly knife with a 8" blade, godly weapon of magics!
As a trained knife fighter... WHY?????
They're so slow and hard to use! Not to mention they're rate of breaking / malfunction DURING a fight and inability to do anything beyond a slow stab into VERY soft tissue.
As for me, I have to go with a form of the rapier known as the
Sweiter, a lighter version of the German
Kriegsmeiser.