Achlys

Achlys does not possess a single canonical origin story in the surviving Greek corpus but appears in multiple literary roles. In Homeric epic the term ἀχλύς denotes the mist that is 'shed' over mortals' eyes at grievous wounding or death, functioning as a poetic symptom of the soul's failing. In the Hesiodic/Shied of Heracles tradition Achlys is personified and pictured among the Moirai and Keres as a dread figure associated with sorrow and the visible signs of dying. A later Roman mythographic reception (Hyginus) identifies a like-named Caligo as a primordial obscuring principle linked to cosmogony, placing her as mother of Chaos and, with Chaos, producing Night, Day, Darkness, and Aether — a receptional expansion rather than a direct reflection of Homeric or Hesiodic genealogies.

Descriptions vary by source. In Homeric passages Achlys is not anthropomorphic but a mist or dark vapour 'shed over' the eyes of the injured or dying. The Shield of Heracles gives a vivid anthropomorphic portrait: Achlys stands 'gloomy and dread, pallid, parched, cowering in hunger, thick-kneed' with long claws beneath her hands; mucus flows from her nostrils, blood drips from her cheeks to the ground, she grins dreadfully, and 'much dust, wet with tears, lay upon her shoulders.' Nonnus's Dionysiaca does not elaborate a comparable physical portrait but presents her as a Thessalian source of treacherous flowers and magical ointments.

Across the attestations Achlys performs three related functions. Lexically/Homerically she is the mist that 'sheds' over eyes at the brink of death, producing blindness, loss of consciousness, or the appearance of death. In the Hesiodic iconography she embodies sorrow and death's bodily signs, implying an associational power to accompany or signify mortal demise and grief. In Nonnus (Dionysiaca) Achlys supplies 'treacherous flowers,' 'poisoned drugs,' and a 'magical ointment' used to induce sleep, to anoint victims, and to effect transformative or corrupting results when applied — a narrative role as a supplier of pharmaka within Thessalian-associated witchcraft. The Roman Hyginus reception (Caligo) attributes a cosmogonic generative power in one late tradition.