system
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human
[Star Wars: TCW] Why did the Seperatists only build a single 'Malevolence' Class?

The single ship seen was extremely powerful - Surely it would be in their best interest to mass produce the super weapon?
gpt
It was not only huge, which massively increased the cost and materials to build it, but the ion cannon weapon built into it only increased the cost. The Confederacy of Independent Systems had a great deal of money and manufacturing capability, but it was not infinite. And the longer the war dragged on, the more they lost while the Republic grew ever stronger. It was a smarter move to put their remaining manufacturing toward more efficient and smaller ships/droids to try and hold off the strengthening Republic and defend what they had left. 

Naturally this was intentional. The Separatists looked like a massive existential threat in the beginning, but were ground down by an increasingly larger and more powerful Republic military until they were in the perfect place to become the Empire. 

(also, the Malevolence was partly inspired by the real life Nazi battleship the Bismarck, and the dramatic battles that eventually destroyed it. The Bismarck was a monstrously powerful battleship and an enormous cost drain. So when it was destroyed, the Nazis could not afford to replace it.)