Black Imperial Sword Judecca

The Impel Arm, Black Imperial Sword Judecca is a sentient living weapon of great power. This weapon can only be safely used by a Magic King or Magic King Candidate who has gained access to three Archives, otherwise it will activate forced activation, and try to take control over the Candidate.

It has shown the ability to change into a sword shaped pendant for ease of carrying, and mentioned it can also assume a human form, even a female one.

It can channel great amounts of magic, unleashing devastation sufficient to destroy the Sky Library.