Cobra is a member of the Oración Seis, a dark guild composed of highly powerful mages. He, along with the other Oración Seis, seek to find Nirvana, a destructive magic power that was sealed long ago. Cobra is accompanied by a huge snake, Cubellios, whom he considers to be his only friend. During his fight with Natsu, it is revealed that he implanted a dragon lacrima in his body, making him a second generation poison dragon slayer. He later joins Crime Sorcière together with the rest of the Oración Seis members.