Assuming a Mortal like Goku or Jiren has enough power to one shot a universe, how will they able to achieve it?

[DSB]

I just cant see then using a full power ki blast at the center of the universe which will blow everything else up.

How can they do it?

[KBABZ]

One possible way would be to place themselves in a space outside one of the universes and fire at it from there (bursting the bubble, or something?). Another would be expending all their energy in a massive suicidal blast like Chiaotzu or Vegeta did.

[Polyphase Avatron]

Probably by creating those odd shockwaves and causing everything in the universe to disintegrate. Possibly including themselves.

[Tsufuru]

a ki blast like zeno did to future trunks timeline.

if some1 is universal level that he can do it just like some1 whos planet level can blow up a planet.

[Polyphase Avatron]

a ki blast like zeno did to future trunks timeline.

if some1 is universal level that he can do it just like some1 whos planet level can blow up a planet.

That's not a ki blast, that's his erasing power.

[Tsufuru]

a ki blast like zeno did to future trunks timeline.

if some1 is universal level that he can do it just like some1 whos planet level can blow up a planet.

That's not a ki blast, that's his erasing power.

it was diffrent than his erasing technique.
doesnt matter anyways, if some1 got universal energy than that means he can destroy the universe especialy in dragonball.

[Polyphase Avatron]

a ki blast like zeno did to future trunks timeline.

if some1 is universal level that he can do it just like some1 whos planet level can blow up a planet.

That's not a ki blast, that's his erasing power.

it was diffrent than his erasing technique.
doesnt matter anyways, if some1 got universal energy than that means he can destroy the universe especialy in dragonball.

No, it was the same power. He just used it on a larger scale.

And the question posed by the OP is how said destruction would occur. I've already given my input on the matter earlier.

[Galan007]

Based on what we've seen so far, the most likely option is via the 'actuality ripples' that were generated during the battle between SSG Goku and Beerus:
[spoiler]
[/spoiler]

Gods have far more esoteric means of universal erasure than what any mortal has yet displayed. /shrug

[Tsufuru]

it was simple shockwaves.
also when it comes to atack size , first form frieza casualy made a moon sized atack to destroy planet vegeta.
and that not counting the explosion.
now imaging what king of atack jiren can do if he wants.

[Kataphrut]

This is one of those hypothetical things. Like how Cell thought he could destroy a solar system with a horizontal beam. Unless the planets were somehow aligned behind where Gohan was standing (including Mercury and Venus) I somehow don't think he could have pulled that off.

[Tsufuru]

This is one of those hypothetical things. Like how Cell thought he could destroy a solar system with a horizontal beam. Unless the planets were somehow aligned behind where Gohan was standing (including Mercury and Venus) I somehow don't think he could have pulled that off.

or he could of let his kamehame ha explode like goku did vs cell.
just like piccolo destroyed the moon with a small beam.
kamehame was never stated or implied it cant caus a explosion when it hit its target and we saw it doing exactly that already so yh.
also 23rd budokai goku was stated to be able to shatter the moon with his super kamehame ha in the guidebook.

[Polyphase Avatron]

This is one of those hypothetical things. Like how Cell thought he could destroy a solar system with a horizontal beam. Unless the planets were somehow aligned behind where Gohan was standing (including Mercury and Venus) I somehow don't think he could have pulled that off.

or he could of let his kamehame ha explode like goku did vs cell.
just like piccolo destroyed the moon with a small beam.
kamehame was never stated or implied it cant caus a explosion when it hit its target and we saw it doing exactly that already so yh.
also 23rd budokai goku was stated to be able to shatter the moon with his super kamehame ha in the guidebook.

The sun contains something like over 99% of the mass in the solar system, so if you destroy the sun you have effectively destroyed the solar system anyway. Whether Cell could do that I will leave up to others.

[Tsufuru]

This is one of those hypothetical things. Like how Cell thought he could destroy a solar system with a horizontal beam. Unless the planets were somehow aligned behind where Gohan was standing (including Mercury and Venus) I somehow don't think he could have pulled that off.

or he could of let his kamehame ha explode like goku did vs cell.
just like piccolo destroyed the moon with a small beam.
kamehame was never stated or implied it cant caus a explosion when it hit its target and we saw it doing exactly that already so yh.
also 23rd budokai goku was stated to be able to shatter the moon with his super kamehame ha in the guidebook.

The sun contains something like over 99% of the mass in the solar system, so if you destroy the sun you have effectively destroyed the solar system anyway. Whether Cell could do that I will leave up to others.

why wouldnt he be able?

[Polyphase Avatron]

or he could of let his kamehame ha explode like goku did vs cell.
just like piccolo destroyed the moon with a small beam.
kamehame was never stated or implied it cant caus a explosion when it hit its target and we saw it doing exactly that already so yh.
also 23rd budokai goku was stated to be able to shatter the moon with his super kamehame ha in the guidebook.

The sun contains something like over 99% of the mass in the solar system, so if you destroy the sun you have effectively destroyed the solar system anyway. Whether Cell could do that I will leave up to others.

why wouldnt he be able?

Ask someone who has a strong opinion about it. Aka, not me.

[AnimeNation101]

Go to the center of the universe and use an explosive wave that will spread across the universe destroying each planet.

Or maybe place a blast full of all your energy into the center of the universe and then detonate it so that the explosion is big enough to destroy the universe

[SSJgogeto]

When Goku SS God and Beerus fought, they created that sphere with high-density energy, which would destroy the universe if exploded (and they were in the edge of universe 7, not in the center). So I think an effective way is just create a sphere with massive power and then make it explode.