We tried to create a highly sophisticated “Fighting Biological Weapon” – with intelligence – that would obey programmed orders and act as a soldier. We called it “The Tyrant”. But from the beginning there was one huge obstacle – it was almost impossible to obtain a living subject on which we could base the Tyrant. The supply of genetically adaptable human beings for the Tyrant was extremely limited.

This is due to the nature of the T-virus. The T-virus variant that was ideal to create the zombies and the Hunters was suitable for most humans, but it had a fault of making the carrier’s brain cells decline.

To transform the carrier into a Tyrant we needed to keep the carrier’s intelligence at a certain level. In order to overcome this issue, Birkin had been working on extracting a variant that would cause the least damage to the brain when it was adapted perfectly to the carrier.