Arquillian

Arquillians are a small sapient alien species from the planet Arquillia.

Overview
Arquillians are a small but intelligent species. They possess a powerful intellect (most like Ben 10's Galvans), a proof of this may be on their Human-sized mechanical suit (like Doctor Who's Daleks), which is used for both protection and locomotion (also hiding their true form). They also possess advanced planet destroying technology

Trivia

 * A member of the Arqullian Royal Family was killed on Earth, resulting in its near destruction.