h₁regʷ-es-

“darkness, murky realm”

Debateddarknesscosmology

Erebus, erebos

Abstract from *h₁regʷ- giving Greek Erebos (underworld darkness).

h₂eyd-tro-“burning place, altar”krep-es-₂“evening, twilight, dusk”skeh₂-mn̥-“a shade, shadow, phantom”