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Simply mastering their style to the limit isn't enough this is why so few Devil Slayers are unable to unleash such a deadly force - something that wasn't really minded in olden times, given the ridicule that one got for simply knowing it, let alone using it. The only way a Devil Slayer can access this technique is by learning it from the last chapter of the book pertaining to their style even then, they must have the specific requirements to read the chapter.
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True to its title as the " Final Devil Slayer Technique" (終極滅悪義, Shūkyoku Metsuakugi), it's the true personification of one's style of Devil Slayer Magic though slightly weaker than the Armageddon technique belonging to the God Slayers, it's much stronger than the Ultimate Art of the Dragon Slayers and other high-class spells of a similar nature, due to the amount of concentrated power contained within the technique. The intense magical aura that surrounds the caster before using the spell. A Devil Slayer to a Demon before activating his ultimate move. When its used, utter annihilation is certain, especially in your case." It serves as testament to my status as a Devil Slayer and proof that I've mastered my style to its utmost limit. "Last Holy Day"), by the Devil Slayers of old. Interestingly enough, it was originally called " Final Sabbath" (究極聖日, Kyūkyoku Seijitsu lit. It should be noted that it can be only used while one is in Devil Synchronization this is due to the sheer power it possesses being too immense on the user while in their base form.
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While normally illegible, it reveals itself if said user mastered their respective style to the best of their ability while fulfilling the proper conditions pertaining to said ultimate technique. The technique can only be learned by reading the final page of the book pertaining to the user's Devil Slayer style. It's only to be used when one wants to throw willingly away the title of " Devil Slayer" in order to accomplish their cause at the risk of becoming a disgrace to their kind. Thus, this technique seen as a taboo amongst Devil Slayers, garnering another title, " Contradictory Bane of the Exorcist" (悪魔祓いの抵触害, Akumaharai no Teishokugai). Ironically, the use of this technique can be seen as a form of heresy: the user's reliance on demonic traits to utilize an immense power in order to slay the very thing the magic was designed for. When compared to other forms of Slayer Magic, it's said that this spell is considered to be the top-tier amongst its kind - outright surpassing the Secret Arts belonging to both Dragon and God Slayers alike. Rumored to have the power to utterly throw nature into chaos, it's a spell that can kill a devil without fail - regardless of their given nature and/or capabilities this gave it the title of " Ultimate Devil-Slaying Tool" (極滅悪用器, Kyometsuaku Youki). Also, the name didn't fit as it sounded holy & sacred - something that often clashed with ironies found in Devil Slayer Magic. "Ultimate Exorcism of the Demon-Slaying Mage"), is the ultimate technique belonging to a Devil Slayer - being both the embodiment & pinnacle of the Devil Slayer Magic style they practice the name was changed by modern Devil Slayers because of the overall nature and conditions concerning this spell - being extremely vicious & cruel.