The Boxes of Carnage (修羅開匣, Shura Kaikou) are the special Box Weapons of the Six Funeral Wreaths given to them by Byakuran, and could be considered the Millefiore's equivalent to the Vongola Boxes. 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 Boxes of Carnage were upgraded so that instead of being implanted in their chests they are activated externally in the same method as any other box weapon.
Daisy's Box is as seen when used against Dino and Kyoya Hibari. This Box Weapon transforms Daisy into a lizard/human hybrid with Sun Flames flowing from his shoulders. Aside from his great strength and speed, Daisy gains the ability to recover from any wound and even regenerate lost limbs using Sun Flames. The limbs or any body part he loses can possibly even grow new bodies.
Torikabuto's Box Weapon as seen when used against Tsunayoshi Sawada and Chrome Dokuro. This Box transforms the user into a moth/human hybrid with eye markings on the wings. When someone looks into these eyes, they lose control of all five senses and their grip of reality thanks to Torikabuto's enhanced Mist Flames. However, Chrome was able to overcome this ability with her Vongola Box, which had the ability to allow her to see through any illusion.
Zakuro's Box Weapon as seen when used against Lal Mirch, Gamma, and Hayato Gokudera. When activated, it transforms Zakuro into a T-Rex/human hybrid with Storm Flames flowing from his shoulders. Not only does the Box Weapon grant him enhanced speed and strength, it also increases his size and durability, with his skin becoming almost impenetrable. Though not as fast as Daisy, he can also repair lost limbs.
Bluebell's Box Weapon as seen when it was used against the Varia. When activated, Bluebell turns into a human/shonisaurus hybrid reminiscent of a mermaid. In this form, she can create a powerful barrier and a pool of 100% pure Rain Flames, which can kill anyone within these flames due to the high purity, causing paralysis at a cellular level.
Kikyo's Box Weapon as seen when used against Ryohei Sasagawa. When activated, Kikyo is transformed into a Spinosaurus/human hybrid with his hair transforming into five waves of Cloud Flames. Unlike the other Wreaths, Kikyo doesn't gain as many feral characteristics, but his power is one of the most dangerous as he can use his Cloud Flame hair to create an army of Spinosaurus. In turn, even these Spinosaurus can propagate rapidly, creating a never-ending army of Spinosaurus. According to Kikyo, he has the strongest Box of Carnage of all the Real Six Funeral Wreaths.
The Lightning and Sky Boxes of Carnage are the only ones to not be shown; however, the Lightning Funeral Wreath, Ghost, was an intangible being; thus, he may have not been able to implant a Box of Carnage within himself. The leader of the Six Funeral Wreaths and the holder of the Sky Mare Ring, Byakuran, however, has other Box Weapons: his White Dragon and Black Dragons.