To become a dark maiden, the candidate must be a [[human]] or a [[halfling]], and must have been recognized by a sanctum or a demonic creature as truly enthralled and devoted to Demonic values. The worthiness of a candidate is measured by the time spent practicing and living according to the ''Demonic Way'', but also the intensity of their actions. A candidate's life and past actions will be judged on their most intense act for each of the Seven Core Values (Lust, Wrath, Sloth, Greed, Gluttony, Envy, and Pride). To be considered worthy, the candidate must receive passing grades in at least four of the seven types of actions.
If judged worthy, the candidate must confirm their wish to abandon their humanity in the name of Hell. This process is known as the ''rebranding''; a corporate euphemism which that refers to the abandoning of humanity in favor of becoming a fully demonic creature. The process is extensive and deeply changing, transforming the candidate's body, mind, and capability to the point of being completely unrecognizable from their previous selves. All potential candidates are informed of the changes involved in the process.
The physical changes are extreme and extensive; regardless of the age, species , and biological sex of the applicant, their body will be transformed into the general shape of a young, female human. If they happened to already match that description, their physiological traits will be modified to make them unrecognizable. Smaller details, such as skin tone, eye and hair color, and other miscellanea are usually retained. The bodies are then covered in intricate tattoo art depicting various demonic symbols and imagery; each dark maiden has unique body art, usually evoking the best or strongest demonic aspect of their lives before their rebranding. For example, a candidate who was particularly good at expressing their Wrath will have body art representing fire, symbols of violence and violent scenes, Angelics being decimated, etc. Lastly and most importantly, their bodies become ageless, and their life expectancy rises to 150 years on average.
The mental changes are also extensive. Dark maidens retain their sense of self (without which they could not express Pride) but are hardwired with indomitable loyalty for Hell. Hell does not consider that its servants have free will, but all are encouraged to display and demonstrate their loyalty in creative ways. Although it is customary to refer to dark maidens as female, using female pronouns, they do not seem to view themselves as anything but demonic in their very nature and identity, suggesting some Demonic form of non-binary identity.