Falchion

The Falchion is the legendary divine dragonslaying sword forged from Naga's fang after his death. It was used by the hero Anri to defeat Medeus, the dark dragon. Later, in Fire Emblem: Ankoku Ryū to Hikari no Tsurugi (and all subsequent remakes and sequels), Marth, the direct decendent of Anri, picks it up after Gharnef is defeated with the Starlight magic, and uses it to defeat Medeus. In Fire Emblem: Shadow Dragon, Marth can recieve a weaker version of the Falchion from Nagi; this version's true origin is currently unknown, but it is possible that it was forged from one of Nagi's own fangs.

Another Falchion, as it has been shown that there are more than one, also appears in Fire Emblem Gaiden where it is wielded by Alm, who uses it to fight Doma. However, this sword was actually not forged of a dragon fang, but was forged as a prison for the goddess Mila, while it sealed her away successfully it did not seal away her power, which gives the sword it's power. After the Falchion defeats Doma, the seal is broken and Mila is freed, destroying the sword.

Only Marth and Alm can wield the Falchion. It is effective againest Medeus and can damage Doma at 52 HP or less. It can also be used as a normal item (as per Vulnararies, etc.), in which case it will recover HP.

Trivia

 * In Kirby: Super Star Ultra, it appears as an treasure in the Great Cave Offensive, worth 375,000 G.
 * In the Super Smash Bros. series, the Falchion serves as the insignia for the representative characters of the Fire Emblem series.