Black Dalek
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The Black Dalek was a high-ranking Dalek, subservient to the Supreme Dalek. (AUDIO: Brotherhood of the Daleks, Daleks Among Us)
They often lead Dalek assault forces or operations, including the invasion of Gallifrey, (AUDIO: The Apocalypse Element) capturing the Sixth Doctor to prevent Davros from building the Juggernauts, (AUDIO: The Juggernauts) and the attack on Bliss.
Black Daleks could self-destruct with such power to destroy a base. (AUDIO: Enemy of the Daleks)