Prime Master

The twelve Prime Masters may be small, but the power they hold is anything but – each one carries within them the spark of one of the original Primes, ancient gods of the Transformer race. When in spark mode, the Prime Masters can unite with a larger 'bot, bestowing upon them the powers of a Prime, to wield in whatever manner the bearer chooses.

This vast potential has made the small robots a hot commodity for Autobots and Decepticons alike, so to minimise this unwanted attention, the Prime Masters hide themselves inside special decoy armor, which cloaks their vast power from the outside world.