Hollow Technique: Purple

Hollow Technique: Purple (「」) is the colliding Limitless, an exceptionally powerful secret extension technique only known to a few in the Gojo Family.

Description
This technique brings the concept of motion and reversal into reality. Purple is born from merging both infinites: Blue and Red, to produce an imaginary mass that rushes forth.

It is initiated by a hand sign that extends the index and pinky fingers outward while leaving the rest folded. Purple is unleashed when the sign switches to a pinching motion using the pointer and thumb while also extending the middle finger.

Rather than the attraction of Blue or the repulsion of Red, Purple is an extraordinarily destructive blast of imaginary mass, capable of destroying nearly anything it collides with. If left unrestricted, it can inflict damage to the caster as well as its surroundings.

Usage
Until his second confrontation with Toji Fushiguro, Satoru was always unable to use Red and therefore never had access to use Purple. Only after the true power of the Limitless was awakened within Satoru could he utilize Red and potentially Purple. Toji was from the Zenin Family and had information on how to counter Red and Blue. Purple is a secret even within the Gojo Family that few know about. Toji was oblivious to the fact that Satoru could unleash such a devastating attack and suffered a direct hit, completely destroying the left side of his body.

Satoru used Purple on a much greater scale to end the enemy invasion on the Kyoto Sister-School Goodwill Event. After dealing with Juzo Kumiya, Satoru noticed Hanami was a fair distance away from him and would likely get away. In an attempt to exorcise the special grade from a great distance, Satoru decided to go all out and unleashed purple. This annihilated a great portion of the forest and was so nonstandard that Aoi Todo couldn't even tell if Hanami was exorcised.

As the first blow against Sukuna for their fight, Satoru unleashed Purple at 200% its power by performing the technique's gestures and chanting its incantation, as well as having his cursed energy output increased by Utahime Iori's cursed technique. The technique completely destroyed about four kilometers worth of buildings between the two sorcerers and was strong enough to destroy Sukuna's arms, who defended himself at the last second by reinforcing them with cursed energy.

Near the end of the fight, Satoru improvised a much more powerful Purple by using Blue and Red separately in the form of orbs before physically colliding them while chanting Purple's incantation. The imaginary mass released from the collision resembled an omnidirectional explosion rather than a directional blast, destroying a massive part of Shinjuku and seemingly destroyed Mahoraga while heavily injuring Sukuna.

Trivia

 * The incantation for activating this technique is "Nine Ropes. Polarized Light. Crow and Declaration. Between Front and Back." (〝〟〝〟〝と〟〝の〟).

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Équation Imaginaire, Violet