The Ten Commandments (Ten Powers Sword in the English dub, or TCM for short) is the sword that draws the inherent powers of the Rave Stones. It has ten forms corresponding to the nature of the stone's ability being summoned. Only the Rave Master has the ability to wield the weapon, and only when the Rave stone is incorporated onto the sword will it work.
The Ten Commandments' default appearance is a huge sword with a slot in which the Rave stone is inserted. This normal configuration of the sword is known as the first of its ten forms, The Steel Sword: Eisenmeteor (鋼鉄の剣「アイゼンメテオール).
Its rain-guard is triangular, with intricate patterns embellished on it. On its central ridge are the words "Eisenmeteor" (only in the manga). The sword vertically reaches Haru's torso, and save for the Rave Masters who are capable of wielding it easily. But true to its appearance, it is a regular bulky metal sword with no special abilities.
As mentioned, the TCM's Eisenmeteor form is just like any other regular sword with no special properties, except for manifestation into its variations even if the Rave is not embedded into the sword. But despite just being a steel sword, it is able to cut through magic shielding without resistance, thus useful against magic-using opponents.
- It is known as the Decaforce in the English anime adaptation and Ten Powers in the English manga version.
- A weapon of the same name appears in Hiro Mashima's next work, Fairy Tail. In the series, Erza Knightwalker employs a magic staff that changes forms, depending on the nature of the ability Knightwalker wishes to draw out. The staff shares the name and abilities of the Rave Master's sword, save for Gravity Core. In addition, Knightwalker's weapon is not known to possess the forms of Eisenmeteor, Million Suns, and Sacrifar.