Rapier

The  Rapier is a very thin and elegant sword with equipment bonuses and attack speed equal to those of a Rune Scimitar with the stab and slash bonuses being switched.

Obtaining a Rapier
In order to obtain a Rapier you need to have completed the quest Cabin Fever, and have a Book o' piracy in your inventory.

Head to Mos_Le'Harmless via boat and you should arrive at the docks on the south-west portion of the island, you will find Smith on the docks. Simply ask about cutlasses and then about the rapier you will be told a short story about how Smith found the Rapier. He will then offer to sell it for 25,600 coins.