Sword of Bruncvik

This sword, among two others called Excalibur and St. George's Sword, can kill dragons because they were forged from the blood of dragons. Reputedly only 5 or 6 such swords remain in existence.

Dr Visyak, who owns the Sword of Bruncvik, tells Dean that "finding it took two decades, countless hours, and some really bad sex with an eastern European ambassador." She describes it as the love of her life. The sword is bound to a stone to protect it, and Dr. Visyak tells Dean that, according to the lore, only a knight ready to slay a dragon can pull the sword from the stone. Dean is unable to extract the sword so he resorts to plastic explosives, which, though they free the sword from the stone, break the sword in half!

When Sam and Dean track down two dragons who have been kidnapping women, Sam uses it successfully to kill one of them while the other escapes.

Bruncvik is a hero from Czech legends who left his wife to go pursue adventures in foreign lands. Along the way he acquired a magical sword that had the ability of chopping of heads with a simple command: “Blade, heads off”. Later he encounters a white lion battling a nine-headed monster and he helps slay the monster. He and the lion become friends and travel together.