(Written from a Production point of view)
The Nemesis Report File is a non-canon piece which first appeared in Gameplayers Magazine. Based on some official facts, it contracicts official canon in some places due to translation errors in the game.
Origin of Nemesis
The unknown character that stalks Jill, widely known as "Nemesis", is actually Umbrella's T-virus B.O.W test subject "Nemesis T-type". It means "Goddess of Vengeance", and it was nicknamed "Nemesis" by its research team, as they were going to make S.T.A.R.S. members pay for what they did to the Tyrant.
Nemesis was a Bio Organic Weapon developed by the European branch of researchers in Umbrella Headquarters, as a parasite that aimed to control any T-Virus B.O.W. When the parasite is implanted into a B.O.W, it will control the body and also enhance its combat effectiveness.
Although T-Virus B.O.Ws are being researched and developed by every research team in all Umbrella branches, all results produced were mostly failures, which ended up with low intelligence. In the military, besides combat, the intelligence to understand and follow orders is important too.
The American branch research team under William Birkin, after countless attempts to control DNA, succeeded in making the Tyrant T-001. Shaped like a human and with the high combat effectiveness of the Tyrant, it gained a large reputation in Umbrella Headquarters. However, it lacked intelligence.
On the other hand, the research team in the European branch, unlike Birkin's research team, focused on enhancing the B.O.W's intelligence. Countless theories and attempts were made. At first, they tried the operation method, that is, improving the level of intelligence by operating on the brain of the B.O.W. Now, they had advanced to the level of their research to the point of increasing the intelligence of the B.O.W by just inserting a parasite. The team imported a lot of B.O.Ws from the American research team under Birkin, and made many experiments.
As the American branch under Birkin successfully improved and created a better Tyrant, the "T-002 model", which can follow simple orders easily, the European research team had created a test product parasite, the "NE-Alpha".
The "NE-Alpha" was tested on the B.O.W "Hunter", and again countless experiments were made. To better demonstrate the result, the European team imported many new Tyrants, the "T-103 model".
At this time, the parasite had already gone through many modifications, and this was implanted into a Tyrant and was called the "Nemesis T".
Ability of Nemesis
The Nemesis parasite was implanted into the spine of the Tyrant. In this case, the parasite catalyses the -Virus cells in the body and the result is an invasion of the brain by the new bunch of cells, gaining the control of its cerebrum.
Nemesis will form a second "brain" behind the original one, taking over the jobs of the former brain. The organs will be under the control of the "Nemesis". Its healing ability and speed will be greatly enhanced by the Nemesis, but the most significant improvements will be from the results of the improved intelligence of the Nemesis. As time passes, the Nemesis will take over control of the main and former brain too.
The Europe branch research team developed 4 Nemesis T models. One of the Nemeses maintained the capability of independent thought during a stage of development, and attempted to break free. Although the Nemesis was based on the Tyrant T-103, the great results of the parasite shocked the developers themselves.
The Nemesis was destroyed, and the rest of the Nemeses got their intelligence "restricted".
In the Raccoon City incident, the Tyrant sent into action was the second model of the Nemesis, the "Nemesis-T02", which had undergone the longest period of training.
Nemesis Normal Mode
The Nemesis-T02 is very smart. Smarter than the Tyrant that Umbrella had been using. The Rocket Launcher that Nemesis uses in this game is designed specifically for Nemesis, and is too heavy for a human to carry, let alone operate it.
Nemesis Cautious Mode
Although the black armour of Nemesis is slightly bullet proof, under heavy fire, Nemesis will still sustain damage. Then it will turn to "cautious" mode. There is no significant change in the appearance, but the defence system will cause it to use part of its tentacles as a weapon now. In normal mode, the tentacles were only used to inject the NE-T virus into its victim. Now, the tentacles contain a liquid compound, which affects the nervous system of the victim, restricting the victim's movement.
Nemesis Second Mode
After sustaining heavy damage, Nemesis will produce a type of secretion that speeds up the reaction of its cells. The result is the recovery of wounds, but it severely affects the normal recovery system when it is in normal mode. As the speed of the cell reactions becomes faster, the appearance of Nemesis will begin to transform, bringing it more further than a human face. Under this condition, Nemesis will slightly enlarge a little, and the tentacles now loosen up, flowing more freely than usual. This will mean a greater tendency to infect a human and is therefore much more dangerous.
Unlike Tyrant, Nemesis will not go berserk under a mutation.
Nemesis Third Mode
After Nemesis had gone through much more damage, some of the functions of Nemesis were disabled. This in turn spikes a mutation. Nemesis will lose its head when it undergoes this final weird mutation, and this time, even Nemesis will not be able to withstand the mutation and will go out of control.
Nemesis will start devouring all sorts of living creatures it comes across in order to obtain the nutrients needed to grow bigger. The tentacles will wrap and tangle around its self to form the limbs that replace the hands and legs, which had gone amiss during the mutation.
The fast chemical reaction inside the internal body of the Nemesis will start to create a conflict between the T-Virus cell and the Nemesis cell. The confliction of the 2 virus cells will cause a chain reaction in which they will swell together as a result, bursting out of the body of the Nemesis like a bubble, and spat out as a highly acidic compound of the T-Virus and the Nemesis-T virus!
Despite the mutation, Nemesis will never forget its mission... to wipe out the S.T.A.R.S..
The Reason To Send In Nemesis
The reason to send Nemesis into Raccoon City was to eliminate the surviving S.T.A.R.S member(s).
The Umbrella HQ decided to send a Umbrella Special Forces Unit (U.S.F.U) led by HUNK, into Raccoon City to assassinate William Birkin. They planned to steal his G-Virus before he betrayed Umbrella by joining its rival company(ies).
But, Umbrella knows that should the S.T.A.R.S. members know their plan, it will be difficult for Umbrella to carry it out. Since the mansion incident, S.T.A.R.S members had discovered the true face of Umbrella. There are reports that the surviving S.T.A.R.S members are planning to make an attack on Umbrella. Although the reports are still uncertain and there have been no obvious signs of action from the S.T.A.R.S survivors, Umbrella is still very wary of them.
If William Birkin has the S.T.A.R.S members on his side, he might expose Umbrella's illegal activities. Should that be the case, Umbrella will have to go against the U.S itself. Even though the U.S. government is one of the secret customers of the B.O.Ws themselves, they will have no choice but to face the Umbrella Corporation from the pressure of the public when Umbrella gets exposed. If things got worse for Umbrella, they might even find themselves going against the rest of the world as well, which of course, will be something too much for Umbrella to handle.
Sensing this danger, the higher ups of the Umbrella Corporation decided to send in the Nemesis-T type. Although the Nemesis Tyrant is an expensive B.O.W product (budget), because S.T.A.R.S had even defeated the Tyrant T-002 before during the mansion incident it would be wise of them to send in a better tyrant this time instead, thus the Nemesis.
Other than that, Umbrella has sent 6 Tyrants to Raccoon City as well. They were supposed to be in the mid-air of Raccoon City for emergency, ready to be sent into the R.P.D at anytime if the Umbrella Special Forces Unit failed in their mission. But on September 29, all Tyrants were sent into action.
- The Nemesis' code name in this work - "T-02" - was reused by Resident Evil: Operation Raccoon City.