Supermassive Black Hole yield

[ArbitraryNumbers]

Okay, so we know that most galaxies supposedly contain supermassive black holes in the center that hold the galaxy together, right?

I would like to know what energy yield a black hole like that would have. That way I could use it as a reference for Kirby's 4-A feat of defeating Dark Nebula, who created an omni-directional explosion at the center of a galaxy while at the very least extremely close to the supermassive black hole, if not directly within it. The attack reached at least hundreds of kilometers until all that was visible was a faraway galaxy.

My theory is that the feat has the potential of being calc'd to be at a higher level than 4-A.

Of course, that is assuming the following:

-The black hole is in fact a real black hole

-The black hole was in fact the same kind that holds the galaxy together

-The black hole was restricting the omnidirectional attack from reaching a higher distance than it did

Some screenshots here and here.

The former shows that it is indeed a real galaxy, as evidenced by the massive collection of celestial bodies, while the latter shows the black hole.

 

[Foggysniper]

If he did destroy the black hole, how much of the galaxy's mass would be destroyed? How would someone go about calculating something like this?

 

[Gwynbleiddd]

Black Holes don't hold Galaxies together, dark matter does and Black Holes can't be destroyed by regular means.