Fragarach

Fragarach (フラガラック, Furagaku; Irish for "The Answer") is an ancient and unique magical sword that was forged many centuries ago, dating back to when Magic was first introduced to the populace of Earth Land. While known as the Heaven's Radiant Blade (天の烱然刃, Ama no Keizenjin) because of the supposed legend behind the creation of this sword, it has been confirmed that Fragarach was created through Smithing Magic. Originally, this sword was employed by Vortigern the Horseman of War. It is currently within the possession of Tsuyo Morduin.

Description
While the exact origins of Fragarach is lost within history, there is some confirmation that Macha has been able to bring up thanks to her expertise in Smithing Magic. Much like her own sword, Fragarach was created using the legendary precious metal known as Orichalcum, having earned a reputation for being indestructible no matter what it is assaulted with. It also seems that this sword possesses some form of sentience as it shocked Macha when she tried to pick up the sword. From what she has theorized, Fragarach is capable of looking into a person's mind or soul to see where they are worthy of even holding it. So far, only one person has been able to wield the sword outside of the other wielders: Kogu Marlowe.

Before being drawn out of the stone pedestal, Fragarach appeared to be a bluish-colored longsword. The blade is long and double-edged, with the forward-facing edge curving outward to form the guard. The handguard is heavily designed with rings slanting down it and reversing at the center of the handguard. The pommel carries a round piece that almost resembles a face. Near the pointed out part of the handguard, there's also teeth biting into it.

After being drawn out by Tsuyo, the appearance of Fragarach changed in order better suit its new wielder. While still taking the form of a longsword, the weapon is now stainless black in texture, and uniquely shaped—it doesn't seem to possess a discernible hilt, instead, it seems more like a stylized hunk of metal with a sharp edge. It is intricately woven, to the point that it could possibly function as a blade on both sides.

The longer side has a curved edge—curving slightly upwards like a proper sword with numerous wing-esque markings. The opposite side is the antithesis of this—it is slightly shorter, with various handle-like hunks of metal which jut downwards, perhaps serving the purpose of a temporary grip.

Abilities
Limited Sentience: Answering Overcharge (烱然刃限界突破 (アンスウェリング・オーバーチャージ), Ansuweringu Ōbāchāji lit. Radiant Blade's Limit Break): The special ability of Tsuyo's Fragarch- it has been embedded within the blade ever since it's creation, thus the ability's exact origin is somewhat unknown. However, when activated, it has an extremely powerful effect. When Tsuyo calls the name of the blade, magical energy intensifies and converges from the blade's hilt onto the weapon's edge itself, before being released outwards, covering Tsuyo like a blanket momentarily. Moments later, the magical energy seeps into his body and becomes infused into his magic origin, providing him with an enormous boost in powers. It infuses and accumulates magical energy into his weapon and body, momentarily injecting an arbitrary vector that allows for an exceptional boost of his abilities by instantaneously releasing the magical energy to reinforce himself. It can be called a jet blast of magical power to increase his movements in close combat, and executing large-scale body reinforcement through the ability is only possible with his immense magical power. This boosts the power of his spells to the point that even the most basic of his attacks are capable of splitting the sky and rending the earth with ease, dealing incredible damage to the opponent just by grazing them. However, most importantly, Answering Overdrive, augments his magic Requip: The Survivor in a major way. Normally, Tsuyo would be unable to choose the armour that is equipped onto him when the magic is functioning- however, with Answering Overdrive, Tsuyo is able to designate which armour forms upon his body when The Survivor is in effect, and the ability of Answering Overdrive augments the armour to the point that his skills are enhanced all across the board.
 * Form Shifting:

Trivia

 * , known as 'The Answerer' or 'The Retaliator', was the sword of and later,  in Irish Mythology. It was said that no one could tell a lie or move, with Fragarach at his or her throat, thus the name 'Answerer'.
 * Tsuyo's title as the "Sword of Retaliation" (癒の剣, Haraise no Tsurugi) comes from the alternative name for Fragarach.