His Hyper-Bullets alone would be enough to one-shot/BFR Maxima...
"A great tactician creates plans.
A good tactician recognizes the soundness of a plan presented to him.
A fair tactician must see the plan succeed before offering approval.
Those with no tactical ability at all may never understand or accept the plan.
And when a mind is too deficient in understanding, the resulting gap is often filled with resentment."
I believe those were toys from Metron. It was kind of disappointing reading his stories for the first time after hearing the hype, and learning he wasn't completely a self made villain, but had one of the most powerful and most brilliant New Gods backing him.
Soon as his patronage was withdrawn, Black Zero folded like a house of cards.