Phantom pain

The PDA you found in the Gunsmith's suitcase points towards a psi-generator in Pripyat-1 Underpass that has been repurposed into a container for the blueprint of an advanced weapon. The machine must be switched on and the battery drained completely before the blueprint can be accessed.
== Walkthrough ==
=== The generator ===
Head over to Pripyat-1 Underpass, and get to the main dome. The generator is on the crane crossbeams; parkour up to it.
Here's a video with the route:
Interact with it, and the waves of psi-phantoms will start appearing around you.
Keep shooting at phantoms - you need to hit 100 of them for the quest to advance.
Search the generator for the blueprints, but get away fast before the generator itself explodes and you'll lose them forever.
=== Crafting the weapon ===
See Tools for Vasily for the requirements to make electromagnetic weapon upgrades. Obtain the required materials, base weapons listed in the blueprint description in the tooltip, and 150000RU as the payment for the work.
Speak to Vasily, give him the blueprint and materials, and let him craft "Hostel", an advanced Gauss assault rifle. The job will be complete in one day.
== Notes ==
* This shouldn't be too difficult if you have some stacked psi resistance, as you can miss a few phantoms and still survive easily. Take along a pistol with about a hundred shots of cheap ammo. Depending on your setup, you might even not need to shoot at all.
== Bugs ==
* The description on the "Hostel" blueprints (the ingame item) is wrong; you need two Flash artifacts, not one. Vasily's dialogue in Tools for Vasily has the correct requirements.