The Dragonslayer, also known as the Dragon Killer, is Kliff Undersn's signature weapon.
It is a large blade which was forged from the scales and fangs of a dragon. It also retains the essence of the dragon whose blade it was created from as well as the spirits of the dragons that were slain by it.
- The name, size, and simple design of the blade is likely a reference to Guts's sword of the same name in the manga series Berserk.
- The Dragonslayer is the largest known sword in the series with a blade (approximately) 5–6 feet long and 3 feet at its widest.