Monk (species)
From Tardis Wiki, the free Doctor Who reference
The Monks used a virtual simulation of life on Earth in order to plan an invasion. Virtual constructs included simulations of the Twelfth Doctor, Nardole and Bill Potts. (TV: Extremis)
Biology
The Monks' appearance was that of a corpselike humanoid. They had greyish blue skin, pointed ears and long fingers. They seemingly lacked eyes and noses. They typically wore robes and hoods with various shades of red, hence their name. (TV: Extremis)