Actually the death star is CONSERVATIVELY 3x to 10x more powerful of a reaction produced by its super weapons vs the entire halo network. (I say conservatively cuz even that calculation i did depends on there being 4.5x10^18 (70 kilogram under 1 earth G) humanoid life forms within the galaxy at the time of the halo network firing, and the destruction of that many life forms only equates to BARELY the mass of the planet MARS which is SMALL for a rocky planet's sized & mass and by that calculation the death star's super laser IS 3-10x MORE powerful based on the destruction/displacement of mass it produces with ONE firing)