The Chimera’s Heart was the Resurrección: Segunda Etapa of the Kiryuudo leader.
In a last ditch effort to cripple the Kiryuudo the surviving Maryudo severed Kabuto’s soul from his body and escaped with the Chimera’s Heart. They quickly discovered that though Kabuto no longer resided in it, the Heart still heald its power and given to the hier of the Natsuki clan for safe keeping.
By placing the Chimera’s Heart into a host’s body it replaces their own heart making the host a living Conduit of the Red granting them unlimited access to all animals in the universe regardless of origin. The Chimera’s Heart grants its host an unending amount of energy and life force. When activated various marks glow and replicate, spreading over the host's body.