Zone Peter. System Failure

Strange news is coming from Zone Peter: the anomalous lands have acquired an exotic inhabitant, which is hard to imagine for both experienced scientists and for bandits who believe in neither devil nor God, as well as for mercenaries who... have seen it all in life. What do they know! The newcomers have caught the attention of the Keepers themselves! And only an ordinary technician from the Polygon was briefly surprised by the existence of this unusual creature in every sense. It's no wonder, during their first encounter, it saved the wanderer's life, and then led them to the most terrifying place in these already frightening lands — the Dark Forest! Well, the newbie is not afraid of mutants, distinguishes anomalies even at night, and has collected artifacts that no stalker has ever seen. This is the Zone, what is there to be surprised about?
The only thing the new acquaintance does not know is — who exactly is he?