The Vile Engine/Gate Map

First Floor:

Name: Mission Lobby
Depth: 0
Level Link: This mission's lobby is standard.

Second Floor:

Name: Forgotten Trail
Depth: 20
Level Link: random.

Third Floor:

Name: Lichen Colony
Depth: 21
Level Link: random.

Fourth Floor:

Name: Processing Plant
Depth: 22
Level Link: Processing Plant is composed of both random and unique "Compact Area" segments.