In Jujutsu Kaisen, most Jujutsu sorcerers are blessed with abilities that are incredibly powerful and they're given these innate techniques at birth. These abilities are somewhat of a mirror of who these characters are and can be used to devastating effect. However, there are very few sorcerers within the world who have to give something up at birth to stand alongside their contemporaries. These limitations, much like the innate techniques, are also assigned to these specific sorcerers at birth.