The Dragonslayer is the over-sized sword wielded by Guts. Forged by the blacksmith Godo, the sword was originally supposed to be a weapon made for the king of Midland so it would be powerful enough to slay a dragon. But with the sword's large size, the king was displeased and this resulted in Godo's exile. Guts makes use of the Dragonslayer in the slaughter of many Apostles during his journey as the Black Swordsman. Because of its use against many Apostles and evilspirits, the sword exists in both the Astral and physical worlds allowing it to damage astral beings. It's the only known weapon capable of damaging Emperor Ganishka in his mist form.