Beneath the Underground Jungle is the Vault, a large technical installation reminiscent of the Hiisi Base but far more dangerous.
Layout and hazards[]
The Vault resembles a giant abandoned factory, with rusted metal structures and old machinery as far as the eye can see.
The environment here is extremely dangerous as there are plenty of hazards aside from enemies. In addition to explosive crates, oil barrels and toxic sludge barrels, generators and propane tanks and sea mines are extremely common throughout the level. Tanks of acid hanging from the ceiling are also introduced here, in addition to toxic sludge tanks hanging from the ceiling making a return. Pools of toxic sludge are common, with no naturally occurring water to purify it with. Glass acid containers can also be found occasionally. Like in Hiisi Base, electric lights can be found that emit dangerous sparks when damaged.
Beneath the rusted metals you'll find compositions of Vault Rock, a hardier version of normal rock that is tough to dig through. The path can sometimes be blocked by metal pipes, but these can be dug through relatively easily.
Points of Interest[]
- A giant vat of acid can often be found here. It is encased in glass, hinting that glass is the only material that doesn't corrode from exposure to acid. It can be easily broken just like ice, and if this is done then the contents will leak out, destroying much terrain (and possibly some enemies).
- One of the Fungal Altars can be found here around the center of the biome, right before the entrance to the next Holy Mountain.
- A vat of blood with a large brain can be found here, destroying it will often reveal either a Max Health Upgrade or Treasure Chest inside.
Enemies[]
The Vault is littered with dangerous enemies, with a strong emphasis on robotic types and monstrosities:
- Acid Sleazebag
- Small Tentacler
- Tentacler
- Blob
- Angry Blob
- Rotting Corpse
- Gazer
- Maggot
- Robo-Cop
- Flamer
- Icer
- Assassin Robot
- Cricket
- Drone
- Tank
- Rocket Tank
- Turret
- Hiisi Sniper
... and more.
Many of the enemies found in the Vault are stronger versions of enemies found in earlier levels, such as Turso or Snipuhiisi, but with more HP and immune to knockback.
Some rarer spawns include:
Connected Areas[]
Proceeding through the portals at the bottom will lead you to the final area of the main path.
The Lukki Lair can be accessed through the top-west corner of the biome, leading further west to an orb room as well as back up to the Underground Jungle.
Puzzles[]
This page or section includes possible gameplay spoilers or secrets. Tread carefully.
A spherical structure found in the Vault. It has two randomly chosen symbols which determine what you must fill it with in order to receive one of two possible Unique wands, Varpuluuta or Arpaluu.
Only one of the clues needs to be followed for each puzzle, and each clue rewards a different wand (may both give Arpaluu, but spells and stats will change)!
The symbols and what you have to fill it with are:
 |
 |
 |
 |
| Berserkium or Pheromone |
Healthium or Lively Concoction or |
Invisiblium | Polymorphine or Chaotic Polymorphine |
 |
 |
 |
 |
| Ambrosia | Acceleratium or |
Teleportatium or Unstable Teleportatium |
Worm Blood or |
For the final solution of the puzzle, fill it with one of the liquids indicated by the symbols. In the example image at right, it can be either Lively Concoction or Pheromone or Healthium or Worm Blood or Worm Pheromone.
Gallery[]
  The Brain. |
  One of the Fungal Altars. |
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