The Mechari are a race of sentient, mechanical beings created by the Eldan to serve and protect the Dominion. As the Eldan were the most advanced race in galactic history, the elegant complexity of the mechari design makes them uniquely qualified to ensure the Dominion’s continued success.
Sustenance and maintenance
Like any complex lifeform, Mechari require an energy source for continued function. Consuming food is also a useful tool for manipulation. Seeing Mechari eat gives organics the comforting idea that they are, in some way, like them.
Despite the perfection of their design, they do require occasional repair and maintenance in order to ensure the highest level of performance. That being said, they do not age in the same frail manner as organics. There are a number of Mechari Millennials who have lived for more than two thousand years.