The Biffords: They are a strict, rigid group, and they love human blood.
The Clan: A group far removed from the others, they are ruthless, they love torture and death.

Hybrid Souls: Humans who have eternity when they turn 18 after having sex with someone. They possess the goodness of an angel and the anger of a demon. They are hated by the Clans, because they are jealous of the Hybrid Souls because they are superior.

Fire Soul: They are souls contaminated by total darkness, greed and can be stronger than Hybrid Souls, they are rare and happen after a blood pact from a human after being bitten by a vampire on his deathbed. They are severe, everyone fears them.

Auras

Yellow: Intelligence, power of communication, supremacy of reason over emotion.

Blue: Healing capacity through their own energies.

Red: Courage, vitality, excitement, strong sexual energy.

Violet: Creative inspirations, mediumistic powers, health, understanding, balanced mind. The ability to transform suffering into something positive.

Silver: Natural medium, healing capacity. The great challenge is self-knowledge and understanding your special gifts.

Crystal (shining white mist): Healing power, telepathic gifts, medium, purity, goodness.

Green: sensitivity, ability to forgive, self-confidence.

Black: tendency to use sexuality in an instinctive way.