Though it should be noted that it doesn't necessarily create the Black Mercies, it houses them. These are a plant like creatures that naturally evolved on an alien planet. Mongul took them and modified them to create the fear educing breed and the Golden Furies.
Also according to Sinestro, the ship is a System Buster
That's honestly how I feel Mongul's strength should be portrayed. No power up accessories, just raw power. Show him as being one of the strongest characters in the universe. They seriously need to return his other powers. Then he would be a genuine threat to any character.
Someone once mentioned that a fitting character trait for Mongul could be him having a sort of a pastiche of shonen anime tropes. Particularly the idea of wanting to fight an opponent at their strongest, to prove how badass he is.
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