Filtration System

Filtration System is an extremely dark subregion of Subterranean. The maze of pipes and substrates is either pitch black or illuminated by dark red lights, so you can barely see anything besides yourself. Dark conditions combined with the presence black lizards, that hunt by sound and produce little light, make it nearly impossible to survive the region without light source. Glowstones will be very helpful.

Neutral or Hostile Creatures

 * Black lizards
 * Blue lizards
 * Scavengers

Food

 * Bats
 * Blue fruit