Apollo
Batch IV from Subwords. Words from litscape.
Acherontic: adj. “Of or relating to Acheron (see Acheron n.); infernal, hellish; dark, gloomy.” (OED)
Eon: also aeon n. “An age of the universe, an immeasurable period of time; the whole duration of the world, or of the universe; eternity.” (OED)