Herald from the Darkness

Sviblov wants us to find a recipe off of a stalker named Swan in Limansk. He seems quite eager for us to kill this stalker as well...
==Walkthrough==
=== Limansk ===
Go to the teleport that formed in the north part of Limansk in Wanderer. Underneath the antenna is Lebedev, the former Clear Sky faction leader! He seems not to be dead after all.
After babbling some mumbo-jumbo about spirits and the nature of the world being chaotic and contradictory, Lebedev lets us know that what Sviblov is after is not an artifact recipe at all, but a chemical formula. He also repeatedly warns us to be careful around Sviblov.
Lebedev's bright idea is to explore the Labyrinth for the formula. While none of this seems to be making sense, we'll go along with his idea for now.
=== Labyrinth ===
Go down to the Sarcophagus entrance and turn right when facing the wall. Go down the hallway and you will find an unlit campfire. Interact with it and lit campfires will shine in a line down the passageway.
10 semi-cloaked troopers will spawn along the pathway. Head into the passageway to the mutant-infested maze. Another unlit campfire will be in the fogged up room just before the transition to the Cave. Light this one as well.
10 more semi-cloaked troopers spawn, leading you down into the controller's typewriter. The next campfire is near the opposite wall.
Light it and fight 10 more semi-cloaked troopers that lead you into an empty room with one final fire.
Light this fire to spawn Herald, who takes the form of a fire. Herald is a roaming spirit, unable to rest while his murderer goes unpunished. He names his murderer - Sviblov! - and prompts us to search for three pieces of damning evidence against him in the Clear Sky base in Arguments and Facts. He also hands us a fake recipe in the form of a note called Recipe Doll, which we will have to give to Sviblov. The real recipe can be found in the unlit campfire behind us. It is complex and almost unreadable, but in a PDA diary entry Strelok narrows down the Stone of Luck as a vital component. Time to see Barkeep about the Stone we gave him.
=== Bar ===
Barkeep will give up the stone in return for 500,000RU. Take a closer look at the formula.
The names of some artifacts can be barely made out in the mess. "Scalp," "Symbion," and "Caterpillar" seem to be there along with the Stone of Luck. The application of heat makes the anomaly clear.
Take the Stone of Luck, a Controller's Scalp, Symbion, and Plasma Caterpillar and transmute them into a Burner anomaly. Five minutes later, the White Fill emerges. Now we can take the fake recipe to Sviblov in the Swamps.
=== Swamps ===
Pretending that Lebedev has been killed, Strelok hands in the fake recipe. Sviblov lets it slip that he is sending the recipe to a laboratory - when Strelok asks which laboratory, Sviblov pretends that Kholod's bar is the "laboratory" he was speaking about. The quest is marked as complete.
==Notes==
* While it is somewhat unclear in the dialogue, Lebedev may be dead after all. The Lebedev we speak to in Limansk could be a projection of his spirit Herald.
* Each of the stalker spirits in the Labyrinth is named "Unquiet".
* Four to five of the stalker spirits in the second wave drop AKS-74U "Special forces",
==Bugs==