So if one were to wonder about this as Asher did, one would need to try to understand how the Almighty functions. It makes stars explode, but how? The only way that we have previously heard of stars exploding is in a supernova, so it is safe to assume that, as the Almighty uses planets for fuel, it converts the matter of the planet into energy by means unknown (altogether not that unlikely as it has massive heat sinks that we must disable in order to stop the weapon by overheating it) and then injects that into the star it happens to be orbiting. This excess of energy could lead to an explosion approximating that of a supernova. However our particular sun only has a mass of 1/8 that needed for a supernova. So if a similar detonation were to be triggered in our sun, the energy output could be considered to be about 1/8 that of a supernova. So, Asher Mir, if we take the approximate destructive capacity of the Almighty to be 1/8 of a supernova, which has been estimated at 10^44 Joules, that would be approximately 1.25*10^22 zettajoules.
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That is definitely a big number