She's Sexy, Dangerous, and extremely lethal. This is the Demon Mistress.
Desiree is a sexy woman, but she is cruel and vicious to vampires and those who oppose the Demons. She is extremely protective of her family and close friends and she defends anyone close to her. She has a seductive nature, and she has a vicious nature to her. Vampires make her sick and she loves to rip their limbs off and deprive them of blood and watch them suffer, for personal reasons of course as well as the non personal reasons. She isn't scared of her husband, even if he is one of the most cruelest demons of all time and she often shows off her skin to other males, but it isn't in a sexual way. She is more powerful then a succubus and has natural demonic abilities, like being able to shoot lighting from her hands or make fire and spread it about with a flick of her fingers. She also can create black fire, a special fire that can burn a mortal into a skeleton on contact. She also is a fighter and she loves to help train new recruits along side the General and other military leaders of the Demonic Army. She doesn't take insults lightly and she enforced discipline on any who do things the wrong way.
Desiree only needs her body, like her nails or tail to kill vampires or people.
But she goes use a special silver knife that is made of a metal fatal to vampires. It has a golden handle with jewels encrusted on it to be shaped like skulls and a long silver blade that is slightly curved. Once a vampire is stabbed with this long silver sharp dagger, the metal is made of a poison that kills a vampire in about one a half hour and the poison causes a lot of pain and suffering to the vampire. It is also used for killing traitors and other creatures just by stabbing them in the heart. If she slashes a vampire with it, the poison will travel throughout the body slowly and kill the vampire in about two hours.
Desiree was born into the second highest demon clan in the underworld, the Vexir clan. The Vexir clan is made of rare and special demons with the ability of black fire. The females have a succubus look to them but are more deadly and more vicious then a succubus and don't think about sex or sexual pleasures all the time. Desiree lived most of her childhood learning to fight and also how to be the "proper" demon. But her parents were unfortunately killed be a vampire raid while off in the mortal world on a special mission. When she was about 345, she was arranged to marry the prince of the Chaos demon and so she did. She had children and now she is the Mistress of the Chaos Clan and the Queen of the Demonic community.
Now that the war has broken out, she has sworn to hate vampires for the rest of her life. She has sworn to make the new soldiers tough and vicious and turn them into demons the best she could with her special ritual. She has also sworn to protect her family and her close friends and take the vampires down. She will not let them have power, even if she has to stop them and in the process, losing her life.