An evil opposite of the Ten Commandments and Lucia Raregroove's primary and strongest weapon. It has the almost the same special forms and abilities as the Ten Commandments except it is powered by a Dark Bring. Its final form, Dark Emelia is named after Lucia's mother. Decalogue is shattered in a battle between Haru and Lucia, then Lucia returns with a much more powerful version of it, Neo Decalogue.[3]