Silverati

The Silverati were humans transformed into semi-synthetic beings by a fusion of Kallisti and the liquid intelligence from Silver's brain.

Biology
The Silverati had silver-tinted skin and black eyes, as well as enhanced strength and reflexes. The Silverati could still feel pain, but were far more resistant to it than humans. They were programmed to be totally loyal to Silver. (PROSE: Hope)

History
Silver created 36 Silverati from cryogenically preserved humans in a bunker on Endpoint. The Eighth Doctor trapped the Silverati on A2756 with Silver. (PROSE: Hope)