cthia wrote:DC Comics
⦁ In Justice League: Crisis on Two Earths, the Quantum Eigenstate Device (QED) is a planet-killing or possibly universe-killing weapon.
And, of course, the opening post of this thread introduces several solar system extinguishers.
Destroying the DCU is irrelevant to the Honorverse. Destroying star systems, one by one, does NOT destroy the Universe (either ours or the Honorverse).
The only possibilities for Universe destruction (that I know about) lie in its expansion:
Possibility 1: the expansion reverses due to gravity and the Universe collapses back to a point; possibly to undergo another Big Bang (this is not expected based on current understanding).
Possibility 2: the expansion accelerates as increasing distance weakens gravity ties, and each star system is left alone in the dark. With star formation no longer possible; the Universe dies as each remaining star burns out. A form of entropy death.
PS: I may have overstated the second possibility; because galaxies might still remain, but each galaxy will be alone. Same eventual result, but on a bigger scale.