In Greek mythology

Greek mythology

Greek mythology is the body of myths and legends belonging to the ancient Greeks, concerning their gods and heroes, the nature of the world, and the origins and significance of their own cult and ritual practices. They were a part of religion in ancient Greece...

, the Keres (Κῆρες; singular: Ker Κήρ) were female death-spirits. The Keres were daughters of Nyx, and as such the sisters of Fate (Moirae

Moirae

The Moirae, Moerae or Moirai , in Greek mythology, were the white-robed incarnations of destiny . Their number became fixed at three...

), Doom (Moros

Moros

In Greek mythology, Moros is the personification of impending doom, who drives mortals to their deadly fate. He is one of the offspring of Nyx , who had conceived him without male intervention, and brother of the Moirae ....

), Death and Sleep (Thanatos

Thanatos

In Greek mythology, Thanatos was the daemon personification of death. He was a minor figure in Greek mythology, often referred to but rarely appearing in person...

 and Hypnos

Hypnos

In Greek mythology, Hypnos was the personification of sleep; the Roman equivalent was known as Somnus. His twin was Thánatos ; their mother was the primordial goddess Nyx . His palace was a dark cave where the sun never shines. At the entrance were a number of poppies and other hypnogogic plants...

), Strife (Eris

Eris (mythology)

Eris is the Greek goddess of strife and discord, her name being translated into Latin as Discordia. Her Greek opposite is Harmonia, whose Latin counterpart is Concordia. Homer equated her with the war-goddess Enyo, whose Roman counterpart is Bellona...

), Old Age (Geras

Geras

In Greek mythology, Geras was the god of old age. It was considered a virtue whereby the more gēras a man acquired, the more kleos and arete he was considered to have. According to Hesiod, Gēras was a son of Nyx. Hyginus adds that his father was Erebus. He was depicted as a tiny shriveled-up old...

), Divine Retribution (Nemesis

Nemesis (mythology)

In Greek mythology, Nemesis , also called Rhamnousia/Rhamnusia at her sanctuary at Rhamnous, north of Marathon, was the spirit of divine retribution against those who succumb to hubris . The Greeks personified vengeful fate as a remorseless goddess: the goddess of revenge...

), Charon

Charon (mythology)

In Greek mythology, Charon or Kharon is the ferryman of Hades who carries souls of the newly deceased across the rivers Styx and Acheron that divided the world of the living from the world of the dead. A coin to pay Charon for passage, usually an obolus or danake, was sometimes placed in or on...

, and other personifications. Some, such as Cicero who calls them by a Latin name, Tenebrae, or the Darknesses, name them daughters of Erebus

Erebus

In Greek mythology, Erebus , also Erebos , was often conceived as a primordial deity, representing the personification of darkness; for instance, Hesiod's Theogony places him as the first five beings to come into existence from Chaos...

 and Nyx.
They were described as dark beings with gnashing teeth and claws and with a thirst for human blood.