Nekkistani

The Nekkistani were a time-active species who had dealings with the Time Lords. They belonged to the Temporal Powers.

Biology
The Nekkistani were described as being a slug-like race. (BFG: Square One)

History
The Nekkistani were a war-like race who, upon the discovery of time travel, became peaceful. (CC: The Time Museum)

The Nekkistani joined the Temporal Powers alliance along with the other time-active factions, due to the events on planet Archetryx. (BFA: The Apocalypse Element)

The Nekkistani rescued Davros from the time vortex and brought him aboard their ship. Davros killed all the crew of the ship. (BFA: Terror Firma)

The Nekkistani managed to learn about an incident in the history of the Monan Host. (BFG: Square One)

A Nekkistani once sold Robert Knox a type 70 TARDIS. (BFA: Medicinal Purposes)

Culture
The Nekkistani were led by an Emperor. (BFG: Imperiatrix)

Technology
A Nekkistani time cruiser was aquired by Davros, who used it as bait for the Eighth Doctor in the time vortex. (BFA: Terror Firma)

The Agent once owned a Nekkistani time capsule. (BFA: Her Final Flight)