Rapier

Rapiers are swords that usually can only be wielded by a specific Lord character. They usually cannot be dropped or sold. The Rapier is unique in that it is effective against cavalry units and armoured units simultaneously. This trait is shared with six other weapons in the series - the Wolf Beil, Mani Katti, Reginleif, Regal Sword, Thani, and the Wing Spear. The Regal Sword is even identical in stats to the Rapier.

In Fire Emblem: Fūin no Tsurugi, Rapiers could only be wielded by Roy. In Rekka no Ken, they could only be wielded by Eliwood. In The Sacred Stones, they were wielded by Eirika, and finally in Fire Emblem: Ankoku Ryū to Hikari no Tsurugi and its remake, they were wielded exclusively by Marth. The only games where the Rapier is not exclusive to the Lord character, are Monshō no Nazo, where the dancer Feena could wield it, and Thracia 776.

Confirmations of multiple Rapiers in one game (from villages, chests or large red-roofed houses in certain levels, not secret shops) were made in Fuin no Tsurugi, Rekka No Ken and Sacred Stones. In Shadow Dragon, they can be bought in specific armories along with Shiida's exclusive weapon, the Wing Spear (though the armories in question have only one of each in store). The rapier is not very powerful, but it has high hit and critical stats

Rapier
Fire Emblem shadow dragon: