This article, Fire Release: Great Fire Annihilation, contains content taken directly from our mother site. All credit of such content is reserved the original authors over at Narutopedia, the original article can be read here: "Fire Release: Great Fire Annihilation".
A technique where chakra kneaded inside the body is converted into fire, and then expelled from the mouth in a massive wall of intense flames, which covers an expansive range. This makes the technique extremely difficult to either avoid or contain, with it requiring the combined efforts of several Water Release users in order to extinguish the flames.
The first kanji in the word, annihilation (滅却, mekkyaku) has been replaced with the visually similar authority/majesty which is normally pronounced as 'i' and is also found in the name of Kamui.