What is the most evil spell in the wizarding world? Some would say there’s no spell worse than Avada Kedavra, the Killing Curse that Voldemort used so indiscriminately. … Imperius Curse (‘Imperio’) … Cruciatus Curse (‘Crucio’) … The Killing Curse (‘Avada Kedavra’) … ‘Sectumsempra’ … Creating a Horcrux. 13-May-2018
https://www.wizardingworld.com/features/what-is-the-worst-spell-from-the-wizarding-world