Different from cursed objects, cursed tools are weapons infused with cursed energy. Due to this, even non-sorcerers can use them to combat cursed spirits. Conventional weapons such as katanas can become semi cursed tools over time if the user constantly imbues it with their cursed energy. However, weapons new to the user that are reinforced with cursed energy are not considered cursed tools.
As with sorcerers and cursed spirits, cursed tools are categorized from grade one to four based on their power and potency. The higher the grade, the greater the advantage granted to the user in a jujutsu battle.
Save for Playful Cloud, all special grade cursed tools are imbued with a cursed technique. Additionally all cursed tools imbued with cursed techniques other than, Black Rope and the Sword of Extermination, are special grade.
Powerful cursed tools are extremely valuable. Their monetary worth can range from five hundred thousand to upwards of five hundred million yen. All the cursed tools collected by the Big Three Sorcerer Families were stored in a vault called the "cursed warehouse". The cursed warehouse is located at Tokyo Jujutsu High and is protected by Tengen's concealing barrier. Following the Shibuya Incident, the Zenin and Kamo clans reclaimed their respective weapons, emptying out the warehouse of cursed tools.