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The Dragon Slayer is a weapon used within Breath of Fire IV. It is a sword that can kill an immortal god.
The emperor Soniel attempts to kill Fou-Lu with it, though this fails for unknown reasons. After Fou-Lu beheads Soniel, Yuna then takes the sword. However, Ryu later takes it from him, and Cray uses it to end Elina's suffering, as she has been changed into an Endless.
Though the information is not inside the game, the official source book explains that the Dragon Slayer was originally a god, another Endless that had been summoned incorrectly by Yuna. In this case, only the head of the god appeared, and Yuna decided to crush it and forge it into a sword. However, the god's hatred and desire to find its body remained inside it, and it tries to absorb the abilities of any god like itself to gain more power, presumably making them mortal, which makes them liable to be killed by the blade itself.