What were the final components of Greek spirits that controlled the fate of souls?
Keres (mythology) In Greek mythology, the Keres (Κῆρες ), singular Ker (Κήρ ), were female death-spirits. The Keres were daughters of Nyx, and as such the sisters of beings such as Moirai, who controlled the fate of souls and Thanatos, the god of peaceful death. Some later authorities, such as Cicero, called them by a Latin name, Tenebrae, or the Darknesses, and named them daughters of Erebus and Nyx.
Phren Phren (Ancient Greek: φρήν  "phrēn"  "mind" , genitive: φρενός) is an Ancient Greek word for brain or mind. It's latinised form is "fren" and is found in the English language words schizophrenia, phrenitis, phrenic nerve, frenzy, frenetic. Some ancient Greeks, including Aristotle, believed that the "mind" was located in the heart rather than the cranium. This explains the second meaning of "φρήν": thoracic diaphragm (hence the name of the "phrenic nerve").