Subterranean

The Subterranean is a region that you can only traverse through safely with a light, which you can get either through enlightenment or by trading a scavenger merchant for a rare light stone (take note that the light stone breaks if you throw it). This is the final region in the game. However, if you reach this region before upgrading your max karma the highest level (10), your progression will be stopped by the guardians in the deepest reaches of the Subterranean.

Creatures
The following creatures may be found in the subterranean:
 * Green, Magenta, Black Lizards and Salamanders
 * Scissorbird
 * Centipedes
 * Scavengers
 * Monster Water Kelp
 * Living Grass
 * Guardians

Echoes

 * Two Sprouts, Twelve Brackets

Region gates
Gates to the following regions may be found:
 * Drainage system
 * Shoreline
 * Farm Arrays

Subregions

 * Filtration System
 * Depths

Trivia

 * When entering this region from Farm Arrays, you have to jump off a cliff. This is a one-way trip, but there are several easily missable items of interest on the way down. Down the right side is an echo which will increase your max karma. A colored pearl can be found half-way down the left side off the cliff, but the pearl seems unreachable. You may have to throw an explosive item to blast the pearl off.