The Jujutsu Kaisen universe is filled with unique techniques and abilities, each having its respective difficulty to master. From the basics of controlling cursed energy to clearing their minds enough to land a Black Flash, sorcerers continuously train to become the best of the best and make their way up the jujutsu ranks. The ability is widely renowned for being difficult to master is the Reverse Cursed Technique, with even Gojo Satoru, modern-day's strongest sorcerer, struggling to grasp the power of reverse cursed energy.
Source：https://www.cbr.com/jjk-sorcerer-best-reverse-cursed-energy/
