Hypothetical energy source with higher output than Dyson Sphere

For my Science fiction and Fantasy genre book, I need an energy source whose energy output should be much more than even a fully functional Dyson sphere. Can you please suggest some hypothetical concept as an option?

Edit: I need just a Supernovae of energy to make some kind of hypothetical weapon, I don't need continuous source of energy. Moreover, I mentioned Dyson sphere just to indicate that I want to harness very high amount of energy.

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Hypothetical energy source with higher output than Dyson Sphere

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