Unlike normal Box Weapons, these are implanted into the chest of each Wreath on the left pectoral muscle and when opened will transform the user into a weapon/human hybrid with all the abilities of the Box Weapon at their disposal. It has been revealed that when these Box Weapons are activated, all wounds gained before transforming are completely healed.

In the present the Asura Boxes were upgraded so that instead of being implanted in their chests they are activated externally in the same method as any other Box Weapon.[1] They are known as External Asura Boxes (外付け修羅開匣, Sototsuke Shura Kaikō?).