in the first and second novels, left hand can also revive d when his physical condition is suffering, by consuming the four elements and converting the resulting energy into life force. this ability even saved d from the usually fatal stake through the heart he received from rei-ginsei in the first novel. left hand has its own mind and will, and acts as d's guide and sole permanent companion, providing a reservoir of knowledge pertaining to the lost noble culture. so far, left hand's origins are unknown, and it is unclear how they came to be joined. however, some of its nature is revealed in the third book, which features a similar creature; it is implied he was one of the barbarois (human/monster hybrids) who served in the personal retinue of count dracula.