Koloktos' Sword is an enemy weapon in Skyward Sword. It is carried by Koloktos, the Boss of the Ancient Cistern. It is required to defeat Koloktos, as it is the only way Link can destroy Koloktos' legs and metal cage which blocks its core during the second phase of the battle. To temporarily obtain this item, when Koloktos slashes at Link with all the swords on one side of its body, use the Whip to unscrew a hand so that Koloktos drops one of its swords.
This item cannot be taken out of the boss room, as it disappears after Koloktos is slain.