Blood Memories is a trait possessed by Immortals in the Underworld universe, which allows them to transmit their memories through their blood to others in some way yet to be fully explained. This skill plays a major part in the Underworld films, allowing the characters to learn important information that they otherwise would not have known. The memories are obtained through blood ingestion or from a bite from a Vampire or Lycan, or a blood transferal from an Immortal. This process is possibly due to the Immortal virus affecting each species’ brain and nerves and making their other tissues and fluids be obtaining bioorganic signals and information, which could explain the bodies healing ability and survivability.