"Kurchatov trap"

Katana informs Marked One that a merc invasion is about to occur, and she needs his help to drive them off. She instructs you to take the position on the rooftop of the [ city administration] and support the Furies as a sniper.
== Walkthrough ==
After accepting the quest, a stash with the SVD rifle appears on the staircase leading to the rooftop.
Despite Katana's instructions, you don't actually have to go to the roof, as the mercenary invasion starts within 160 seconds of accepting the quest, regardless of where you are. The assault is split into 9 waves of 6-10 mercs each, spawning each 80-120 seconds at city outskirts and coming towards the city administration building. 5 of those waves are also supported by light helicopters.
The mercs will be fighting Furies, probably killing most of them. Katana is invincible and will clean up the mercenaries that don't wander up there, so the helicopters are your main job. Staircase entrance at the roof is a good cover and a good spot to fight them. You can sell Katana a broken machinegun and a magazine worth of ammo, if you want her to mow mercs down faster.
After killing all 5 mercs in the last wave, the quest will be complete. Report to Katana for your reward.
== Notes ==
* The artifact Katana gives you as a reward is a very powerful unique at this point in the game, and boosts your psi regen far more than the Sandstone.
* Vanga buys NATO guns at good prices and is a convenient place to dump all of the loot you can grab from the bodies.
**She is also notable for having the best prices for .45 ACP, 7.62x51mm NATO, and all types of medkits.
*You need to buy out Katana's old gun (a G36) for her to switch weapons. You will also likely want to buy her stack of 5.56 ammunition, otherwise she may pick up a broken G36 from the ground and switch back to it.
== Bugs ==