I had an idea for a creature concept where a race of giant beetles were enslaved and transformed into mechanized workers/soldiers. The information gathered so far points to a nano-robot technology that was able to penetrate the beetles hulking bodies and rebuild them from the inside. The beetles were targeted for their incredibly strong armor plates and ability to survive in open space.
The smaller arc beetles are fit with a regulator and two large mandibles that can attach to power conduits and provide quick charge and programming data very quickly. They move through the pits of the hangars ensuring each vessel is properly maintained.
The larger Generator beetle is often used to store large amounts of energy used for charging ship engines and other constructs. Their technology has been supercharged and is able to pull raw energy from the environment and store it for later use.