infernal region

noun

1. 1

   (religion) the world of the dead

   No one goes to Hades with all his immense wealth"-Theognis

2. 2

   (Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment

   Hurl'd headlong...To bottomless perdition, there to dwell"- John Milton

   a demon from the depths of the pit