This unique weapon can be traced back to the weapon of a Descendant who was known as Code Name Morvalde during the Apocalypse. Morvalde founded the intelligence organization now known as the Colon Special Forces to fight against the Vulgus and he himself was the first Descendant to be called No. 0. However, he equipped distinctive armor and weapons that were unprecedented in Albion at the time, completely different from the plate armor or longswords of knights. Of special note are the records showing how he used the sword Shadow to assassinate numerous Vulgus commanders, clearly demonstrating how capable a Descendant he was. The newly developed "Shadow" was reconstructed based on data obtained by analyzing the weapons of the Vulgus Arche Slayer discovered in the Void Vessel, and just as with Morvalde in the past, it focuses on fast attacks, deadly strikes, and mobility. However, both the past and present "Shadow" closely resemble the appearance of the weapon used by the Arche Assassin, which leads to suspicion that Morvalde's legacy may have been acquired by the Vulgus. As the Vulgus have already been conducting experiments using Descendants, such as the Obliviants and Serena, this suspicion is considered justifiable.
