- Locate the entrance to the hot springs.
- Recover the Orochi bio material testing kit.
- Use the Orochi kit to collect samples from the Filth pools. (4 of them)
- Stand in a filth pool and use the "Bio testing equipment".
- Kill the Elder Zmeu and use the kit to collect samples of the Filth they leave behind. (3 of them)
- Find the path leading further down into the hot springs.
- Find the source of the Filth.
- Follow the cave corridor. It's the Filth Doggy on the level below.
- Kill the Stalker in Darkness.
- Collect a Filth sample from the source.
- Inspect the Orochi laptop.
- Pick up the explosive charges.
- Place the first explosive.
- Place the second explosive.
- Place the third explosive.
- Use the laptop to activate the explosives.
- 40000 , 2 .
- 5 pure dust
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