Reverse Cursed Technique

Reverse Cursed Technique (反転術式) is a variation of a curse technique that takes cursed energy and reverses it into positive energy. It is a very complex technique and is mainly used to heal human bodies.

Description
A reverse cursed technique processes negative energy into positive energy by taking two sources of cursed energy and multiplying them by one other. As a result, the energy that destroys becomes energy that creates, and negative energy becomes positive. Despite sounding simple enough, producing reverse cursed energy is extremely complex and difficult to perform for most jujutsu users.

Reverse cursed energy can be used for various purposes, but most commonly healing. Cursed energy comes from negative emotions, which are unfit for healing living things. However, cursed spirits that are made up of cursed energy don't require a reverse cursed technique to heal. Jujutsu sorcerers use reverse cursed energy mainly for generating new flesh to heal human bodies. While very few sorcerers can utilize a reverse cursed technique, there are even fewer that use it to heal people other than themselves.

Cursed Technique Reversal
Reversed cursed energy can also be used instead of regular negative energy to power a Cursed Technique Reversal. By applying positive energy, the effects of the technique will be reversed. For example, by fueling the Limitless technique with positive energy, Satoru Gojo can bring infinity, which is normally an invisible phenomenon, into reality as a tangible explosive force.

Mechanics
The cursed energy multiplication table below represents how a reverse cursed technique creates positive energy from negative energy:

Negative x Negative = Positive Cursed Energy (-) x Cursed Energy (-) = Positive Energy (+)

Shoko Ieiri
Shoko Ieiri is one of few people who can use a reverse cursed technique to heal others. She is considered incredibly valuable to Jujutsu High. Thanks to her talent for utilizing a reverse cursed technique and her medical knowledge, she earned her position as the school doctor. Despite being incredibly well versed in utilize reversed cursed energy, she has never been good at explaining it to others.

Ryomen Sukuna
Unlike most cursed spirits Sukuna is capable of using a reverse cursed technique. He's incarnated in Yuji's human body, so he uses reversed cursed energy to restore it rather than cursed energy like a traditional curse would.

In order to push him to making a Binding Vow, he removed Yuji's heart and use his ability to heal as a leverage. After they agreed on terms of Vow, he healed Yuji's heart and returned him from death. Mahito mentioned that a reversed cursed technique could revert the shape of a soul back to normal to remove the effects of Idle Transfiguration.

In Shibuya, when Sukuna found Megumi in a state of suspended death, he used a reversed cursed technique to heal him and ensure Megumi survived.

Satoru Gojo
Satoru Gojo is able to use reverse cursed technique to heal himself and to perform Cursed Technique Reversal: Red. Gojo awakened to use this ability after he fatally injured by Toji Fushiguro. He is able to heal damage inflicted on his head instantly and recovered from dead. Later, he applied the positive energy on his innate technique to reverse its effects. Thanks to this technique, he is able to continuously use his inherited technique without causing harm to himself. Gojo is also able to mix positive energy and negative energy to utilize more powerful technique.

Yuta Okkotsu
Yuta Okkotsu learned to utilize a reverse cursed technique early into his tenor as a jujutsu sorcerer due to Rika's immense levels of cursed energy and her ability to unconditionally copy techniques. Yuta first utilized it to heal Maki, toge, and Panda all at the same time after they were injured by Suguru Geto. Suguru was extremely impressed that Yuta was able to use a reversed cursed technique.

Since training overseas, Yuta has become even more proficient in using reverse cursed energy. While stabbing Yuji and technically killing him, Yuta immediately healed him to preserve his life. Shortly after Yuta used a reverse cursed technique to heal Naoya.

Uraume
Uraume is able to use reverse cursed technique to heal themselves. However, Uraume is not able to remove the poisonous effects from their body.

Trivia

 * The Sword of Extermination is imbued with "positive energy" similar to Reverse Cursed Technique.