Nyx

Nyx was an experimental biological weapon stored in Raccoon City.

In late 1998, at the height of the T-Virus outbreak in Raccoon City, Nyx was stolen by USS Commander Rodriguez, likely at the request of Linda. A UBCS team was dispatched to track it down, led by Arnold.

Depending on the actions of the player Nyx may be accidently dropped from the helicopter onto the highway overpass. when the UBCS team goes to investigate, they are quckly killed, their bodies absorbed into the creature's biomass.

To make matters that much worse, a Tyrant is later assimilated, still living, and the Nyx must be fought by the player to escape the city.