'My time has come, but... what's the difference?'
― Tremor's PDA
Tremor was the designated medic of the Skadovsk during the events of S.T.A.L.K.E.R.: Call of Pripyat.
Previous History
Tremor was formerly a doctor or surgeon in the Ukraine - for reasons unknown he decided to enter the Zone on his own in hopes of getting away. He came upon the Skadovsk and quickly became a trusted and valuable addition to the crew, and seemed to take Beard's side in the conflicts between him, Sultan, and Owl.
Appearances
Call of Pripyat
Tremor is only found aboard the Skadovsk, in his office across from Owl's shop. He's a rather kind person, and shows a great deal of concern for people who are injured, but seems flighty and nervous, always avoiding company. He has a certain fixed price for his goods - lower then any other medic - and does not charge to patch the player up if he comes in wounded. In the hunt for the missing Hunter, Daniel, he can be talked to and asked about the wounds on other stalkers in the area - asserting that blood has been sucked from the victims, and only a bloodsucker is capable of such an act.
Shortly after this questioning he will leave the Skadovsk for parts unknown, and the people inside will not seem to miss his departure - Owl takes over his medicinal business. Eventually, the player is tasked to find Glouchar, who has gone missing after discovering something amiss near the Port Cranes. Upon making their way to the cranes, the player will find Daniel dead in front of a shack, and upon opening the door is confronted with Tremor tending to a deceased Glouchar.
Tremor confesses the true identity of the killer - himself. Afflicted with a haemoglobin disorder, he needed a constant supply of blood to survive - which he could not acquire in his original job. Coming to the Zone, imagining he would have no such problem, he instead found himself in a more difficult position. It is suggested Daniel was his first victim, and had come to Tremor for medical assistance - his primal need for blood led to him accidentally killing Daniel. When Glouchar came upon Daniel's corpse, he realized that someone else was behind the murders, and meant to ask Tremor of the wounds. In the resulting confrontation, Tremor killed him to silence him, but realized he ultimately blew his cover.
In the North American Steam release, Tremor has a different backstory than the one told above. Tremor claims he suffers from a hemoglobin addiction, one he was unable to effectively control. Before coming to the Zone, he worked at a surgeon's clinic and was able to satisfy his craving by consuming surplus donor blood. Tremor came to the Zone hoping that the harsh environment would force his addiction to the sidelines, but instead he experienced the worst craving of all and could think of nothing else. He decided to make his killings look like bloodsucker attacks and usually targeted already wounded stalkers. Grouse figured out what was going on and attacked Tremor, a battle which Tremor obviously won.
The player can interrupt this monologue at any point and either let Tremor kill himself, or shoot him themselves. This earns the Detective Achievement.
Notes
- While some characters are suggested to have commit suicide, Tremor is the first to actually do it on screen.