Black Imperial Sword Judecca

The  is a sentient Demon Lord Weapon originally sealed in Sky Library before contracting with Arata Kasuga. Since then, Judecca has supported her master and eventualy become one of his primary weapons used in battles.

Personality
Upon being released from her seal, Judecca initially behaved similarly to an automated artifical intelligence system. However, after forming a contract with Arata, her responses gradually became more diverse and less robotic. As a Demon Lord Weapon, she will faithfully follow her master's desires and strive to fufill his wishes. In particular, she will even  indulge with Arata's pervesion.

During battles, Judeccan can provide guidance and analyze the situation to offer the best course of action.

Appearance
Judecca's true form is a longsword consisting of a jagged blade with a hook at the tip. Inside the crossguard contains a round gem that stores Judecca's conscience which allows her to communicate with other people. Attached to the pommel of grip is a long skeletal lanyard that can enfold the user's arm for analysis.

History
A long time ago, Judecca was sealed by the Spriggans who would guard the Demon Lord Weapon inside the Sky Library for many years. Even after the Abyss Trinity destroyed Akio's hometown, Judecca would continue to slumber within the Library.

Sky Library
Inside the sealed Judecca's room, Abyss Trinity observes Arata's party before recognizing his daughter, Lilith.

Some time later, while struggling against the golem, Arata and Akio are unexpectedly forced back into Judecca's room. They initialy are unaware of the Demon Lord Weapon's presence until Lieselotte warns them after sensing the sword's existence. While Lugh and the rest of the group stall the golem, Arata approaches Judecca whose seal suddenly breaks and falls into his hand. Upon contact, Judecca quickly confirms Arata possesses a Demon Lord Element before analyzing his magic. However, after detecting only his Archive Superbia along with Luxuria and Gula, she states that Arata has not yet achieved the Trinity requirement. As a result, Judecca then begins the process to force the Demon Lord within Arata to awaken. Akio attempts to separate the two, however Judecca easily repels her, forcing the ex-Spriggan to use the camera containing Lieselotte to freeze time.

Within the Frozen World, after noticing his arm has partially transformed into the Demon Lord, Lieselotte comments that even if time has frozen, the transformation slowly continues to progress. Arata then forcibly releases Judecca and returns to normal, much to grimoire's concern.

Later, after Arata successfully masters Lieselotte's Logos Art and returns with her to the real world, he then summons Judecca who confirms that he has mastered the Trinity before deeming him as her master. Next, he questions if she can defeat the golem which she verifies that she can easily destroy the target. Arata begins concentrating while wielding Judecca, causing his magic to disappear for a moment before quietly eliminating the golem. Arata comments that he is finally understanding how to use magic as a result of using Judecca. Afterwards, Lugh tries to touch Judecca, the sword binds the thief and erotically absorbs her magic.

While Abyss Trinity attempts to awaken Lilith's Last Key, Arata surprised the Demon Lord and uses Judecca to force him back. However, Abyss easily recovers from the attack while brandishing the Red Imperial Sword Caina. Arata, with Judecca, and Abyss, with Caina, then begins clashing with one another.

Abilities
As a Demon Lord Weapon, Judecca can only be wielded by a Demon Lord or Demon Lord Candidate who has achieved the Trinity. If the requirements are not satisfied, she will initate Berserk Mode, which attempts to forcibly awaken the Demon Lord within the user. If someone tries to interfere the process, Judecca then can repel the transgressors, causing them slight damage. The only way to completely halt Berserk Mode is for the possessor to release Judecca which will restore the person to normal. Otherwise, the transformation will continue to progress, even if time itself is frozen.

However, upon successfully forming a contract, Judecca will become quite loyal to her master, providing guidance and support to fufill her owner's desire. Judecca can quickly analyze an opponent and produce a probability of victory. Furthermore, her ability enables the user to perform Paladin level techniques, such as supressing their magic before unleashing it all at once so quickly before anyone realizes. The release is quite large that even inviduals far away can sense the magic. Judecca also enables her master to cast several different types of magic at the same time. While wielding Judecca, the possessor is able to swiftly overview the surrounding area.

As a Demon Lord Weapon, Judecca can channel a great amount of magic, unleashing devastation sufficient enough to destroy even the Sky Library. If the master wields Judecca effectively, she can overcome and force back against even a Demon Lord.

If someone other than her master attempts to touch her, Judecca will bind the perpetrator and begin leeching the person's magic.

Additionally, Judecca can also transform into a pendant of herself for portability, as well as be summoned by her master at will. She has also hinted at being able to assume a human female form if necessary.

Relationships
Arata Kasuga  -  As her master, Arata wields Judecca during battle while she provides support and guidance. The two first enountered one another when Arata accidentally was forced into the room she was sealed within. Upon approaching the Demon Lord Weapon, Judecca's seal would break and fall itno Arata's possession. However, determining that Arata did not meet the Trinity requirements, she then attempted to force the Demon Lord within him to awaken until Lieselotte intervened. Nevertheless, Arata would later successfully form a contract with Judecca after copying Lieselotte's magic.

Despite forming a contract for relatively short amount of time, Arata has shown to wield Judecca quite effectively, capable of holding his own against the Demon Lord Abyss Trinity. Normally during battles, Arata will usually give instructions to Judecca which she will loyally process. Furthermore, Judecca will also provide information about the enemies and situation, as well as suggest the best possible course of actions to follow. Additionally, the two are on friendly terms, with Judecca even indulging in Arata's pervesion.