" @MisterShin: I know but all the thing he slices hasn't even reached at least 10% of the earth. Reikai is trying to prove here that LHW could destroy the universe, despite the fact that universe, galaxy and solar system have zero defense, 0x0 =0 "
More than 10 LHW in a Universe destroys it anyway so, short answer = yes, LHW can definitely destroy universe and smaller.
Also i dont know where this Zero defence comes from. I think you mean a force field or shield defence is turned to zero, you cant have zero defence already because that means their is nothing there to begin with.
I only know that it turns matter to nothingness, so it would destroy a universe if it could be launched in all directions and to the length of the universe.