Black Leg Style/Ifrit Jambe

An exoskeleton, muscle, and speed... all of which increase strength. Add the Busoshoku Haki I've developed to the exoskeleton, and my legs are tougher, capable of supporting even hotter flames!!!

Ifrit Jambe is a much stronger variant of Diable Jambe, developed by Sanji during the Raid on Onigashima. Having equipped his Raid Suit three times during the Wano Country Arc, it awakened his inert genetic modifications, granting him powers similar to his siblings. Accepting the modifications, but choosing to cut ties with Germa through the destruction of his Raid Suit, Sanji combined his new powers with his old ones to develop a far more powerful technique.

Combining his exoskeleton with his Busoshoku Haki, Sanji's legs became capable of enduring much hotter flames than before, turning blue, producing blazes resembling lightning. Using the enhanced speed and weight behind his strikes alongside it, Ifrit Jambe makes Sanji's kicking techniques incomparable to before.

Techniques

 * Collier: An Ifrit Jambe version of the original Black Leg Style technique. Sanji delivers a kick to the opponent's neck from above. This was first seen in a series of attacks used against Queen. Collier is the French term for neck meat. This is called Collier Coup in the Viz Manga.
 * Basse Côte: An Ifrit Jambe version of the original Black Leg Style technique. While still in mid-air, Sanji delivers a kick to the opponent's left shoulder. This attack is immediately followed by Paleron. This was first seen in a series of attacks used against Queen. Basse côte is the French term for shoulder meat. This is called Basses Côte Blast in the Viz Manga.
 * Paleron: While still in mid-air, Sanji delivers a kick to the opponent's right shoulder, immediately after performing Basse Côte. This was first seen in a series of attacks used against Queen. Paleron is the French term for chuck. This is called Paleron Pound in the Viz Manga.
 * Jumeau à Bifteck: The first of a trio of powerful side kicks delivered to the opponent's torso. This was first seen in a series of attacks used against Queen. Jumeau à bifteck is the French term for brisket. This is called Jumeau à Bifteck Blitz in the Viz Manga.
 * Tendron: An Ifrit Jambe version of the original Black Leg Style technique. The second of a trio of powerful side kicks delivered to the opponent's torso. This was first seen in a series of attacks against used Queen. Tendron is the French term for meat from the upper chest. This is called Tendron Tenderizer in the Viz Manga.
 * Flanchet: An Ifrit Jambe version of the original Black Leg Style technique. The third of a trio of powerful side kicks delivered to the opponent's torso. This was first seen in a series of attacks against used Queen. Flanchet is the French term for flank. This is called Flanchet Flayer in the Viz Manga.
 * Queue: An Ifrit Jambe version of the original Black Leg Style technique. Sanji delivers a kick while performing a handstand and spinning. It is the first of a trio of powerful spinning delivered to the opponent's lower body. This was first seen in a series of attacks used against Queen. Queue is the French word for tail. This is called Queue Crippler in the Viz Manga.
 * Poire: Enhanced by Ifrit Jambe, Sanji delivers a kick while performing a handstand and spinning. It is the second of a trio of powerful spinning delivered to the opponent's lower body. This was first seen in a series of attacks used against Queen. Poire is the French word for pear. This is called Poire Poker in the Viz Manga.
 * Jarret: An Ifrit Jambe version of the original Black Leg Style technique. Sanji delivers a kick while performing a handstand and spinning. It is the third of a trio of powerful spinning delivered to the opponent's lower body. This was first seen in a series of attacks used against Queen. Jarret is the French term for meat from the back of the knee. This is called Jarret Jarrer in the VIZ Manga.
 * Bœuf Burst (バースト): The culmination of a powerful combo making full use of Ifrit Jambe. Sanji performs a burning kick aimed at the center of the opponent's body, blowing the enemy away with a powerful spiraling explosion. This was first seen to defeat Queen and send him flying off Onigashima after a long and devastating series of kicks. Bœuf is the French word for beef. This is called Boeuf Burst in the VIZ Manga.

Trivia

 * An Ifrit is a powerful type of demon (or jinn) in Islamic mythology that are often associated with the underworld and identified with the spirits of the dead. In Islamic folklore, they are a class of generally ruthless and wicked chthonic spirits formed out of smoke and fire. In modern fiction, they are almost always associated with the element of fire.
 * In real-life, flames that turn blue-white are considered to be the hottest, thus it coincides with Sanji using the hottest flames for Ifrit Jambe.
 * During the climax of One Piece Film: Red, Sanji's Diable Jambe is charged by Charlotte Oven's flames and turns blue-white, possibly as an early nod to Ifrit Jambe.