The Vitriol Cesspool's main feature is a lake of poisonous water that saps 75 HP per second; this can be reduced by Terrain Damage Reducer Augments. Past the poisonous water lies an open area with various treasures guarded by hidden Ghillie Falsaxums. Jejebba and Arsenican can be found here during The Mad Monk and The Voltant Visionary respectively. The Squad Mission Contamination Nation also takes place here.
- Heinous Blatta (during The Mad Monk)
- Heinous Forfex (during The Mad Monk)
- Purge Purgovent (during The Voltant Visionary)