system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What is the black oil on the TV show The X-Files?


assistant
The black oil, also known as purity or the black cancer, is a sentient, fluid alien virus that resembles a black oil slick and is capable of independent movement. It infects humanoids by entering orifices, like eyes and mouths, and gains control of their victim. The alien colonists use the black oil as their reproductive life force.