Bloodbending is a fictional ability from the animated series Avatar: The Last Airbender and its sequel, The Legend of Korra. It allows a skilled waterbender to manipulate the water within a living organism's blood, controlling their movements against their will. This technique is considered highly controversial and is often associated with dark or unethical practices. The ability is primarily showcased by the character Hama, who uses it to escape captivity and later teaches it to others. Bloodbending is typically only effective during the full moon, when a waterbender's powers are at their peak, making it a rare and powerful skill.