Death Squad Dalek

Death Squad Daleks were a type of Dalek identified by the Thirteenth Doctor, who described them as the SAS of Daleks.

Characteristics
Death Squad Daleks appeared externally identical to bronze Dalek drones, but had a different attachment instead of the usual Sucker Cup seen on a standard Dalek. (TV: Revolution of the Daleks)

Primary Goal
Death Squad Daleks were the enforcers of the Dalek race. Their main goal was to listen for a Reconnaissance Scout Signal. They Would Travel through the Time Vortex to the source of the Reconnaissance Scout Signal. If there were impure Daleks, the squad, like all Daleks, made it their duty to exterminate them. If there were no remaining impurities, they would start conquering the planet. (TV: Revolution of the Daleks)