Selena's Blade (ルーナの鋭剣 Rūna no Eiken, lit. Luna's Sharp Sword) is a Sword that is introduced in Fire Emblem Fates. Eponymously named after Selena, Selena's Blade bears fairly high Might and a boost to Critical hit, although this comes at the cost of its wielder's ability to dodge and perform double attacks being reduced.
Although Selena's Blade is a weapon exclusive to Fates, it borrows its weapon model from Eirika's Blade, a Sword that appears in Awakening. However it lacks the Brave trait that Eirika's Blade possesses.