Most Powerful attack in the series ?

[Khin]

What do you think is most powerful attack in the series ? Lets say all of the character have equal power and they decide to hit an indestructable machine that generates number based on how strong the attack is (Kinda like the punching machine in the 25 budokai)

[Lunatic Fringe]

Well, the thing is, ki attacks are only as powerful as the user are. The only thing inherently unique about ki attacks are the physical properties and damage dispersion of said attacks(i.e. Kienzan's disc shape, Genki Dama's orb shape, Makankosappo's piercing capabilities, etc.)

[Hitiro]

Well, the thing is, ki attacks are only as powerful as the user are. The only thing inherently unique about ki attacks are the physical properties and damage dispersion of said attacks(i.e. Kienzan's disc shape, Genki Dama's orb shape, Makankosappo's piercing capabilities, etc.)

That's not quite true. Ki attacks have been shown to amplify the users Ki as well. Look back when Goku fired his Kamehameha at Raditz or Piccolo fired his Makankosappo at Raditz. Both their battle powers had increased up to double, even triple, their original battle power. This pretty much holds true throughout the series as Ki attacks have allowed people to make up the difference between them and their opponent. Vegeta's Final Flash against Cell is a prime example. Or SSJ Gotenks' Super Ghost Kamikaze attack against Evil Boo who is roughly 8x stronger than him if you use the SSJ multipliers.

[Polyphase Avatron]

Devilmite beam... one of the most potentially effective

[Lord Beerus]

The Kienzan. It can cut through anything, and if you're skilled enough, you can control where it goes.

[Blackstripe]

Independent of the user's power?

Either Kienzan or Shin Kikohoh. Both of these are absurdly powerful techniques coming from people far, far weaker than most of their opponents.

[FoolsGil]

Mafuba and Devilmite Beam.

[ekrolo2]

Sorbets ring blast.

[omaro34]

Spirit Bomb is the strongest attack simply because it gathers energy from all life forms.

But my fav? The Hellzone Grenade. Too bad it was only used once to no avail.

[dbzfan7]

Sorbets ring blast.

This one. Easily the most powerful attack in the franchise it transcends the fabric of reality.

[apex_pretador]

Shin kikoho

[Cipher]

In all but one of its uses, Dragon Fist manages to kill or incapacitate a foe who should be much, much stronger than Goku.

So, whatever weirdness is going on with that attack, that gets my vote.

[successoroffate]

100 X Big Bang KamehameHa.

[LSSJGODSSJ4Gogeta]

If you can combine techniques, a kaioken Dragon fist.

BY itself, dragon fist.

But techniquely the best thing if everyone is equal would be majin vegtea's self destruction. I mean then you can use 100% of the KI inside you instead of say 5% from Kamehameha or 90% from dragon fist.

The strongest attack ever fired was the universal spirit bomb from the end of GT, although SSJ4 gogeta's big bang Kamehameha could have been stronger if he wasn't holding back.

[Muffin Man]

As far as power generated by a single individual goes, that would have to go to the tribeam and self destruct techniques (I think of them as basically being the same thing, except tribeam is a more controlled version of expending your life force)

As far as raw power in general goes, that would be the spirit bomb (as its power is virtually limitless as long as enough people give their energy).

[Lionel]

If you mean in the sense of destructive output then conceivably the Spirit Bomb. Shin Kikoho seems incredibly powerful in its own right without any external amplification from other sources of strength. With regards strictly to lethality of the attack, that distinction should go to the Kienzan and any other techniques that can neutralise indiscriminately without the need for a comparable power level.

[Tectorman]

Assuming the same base power level, the Dragon Fist. In GT, even as a SSJ4, Goku still uses a regular Kamehameha and the x10 Kamehameha, so the x10 Kamehameha being a separate thing (and as it says on the tin, ten times stronger) should be a thing. Considering the x10 Kamehameha does zilch to Syn Shenron but the Dragon Fist blows Omega Shenron (self-styled to be ten times stronger than Syn) to pieces, the Dragon Fist should be more than a hundred times the power of the Kamehameha. And according to the fight with Raditz, the Kamehameha is slightly more than a doubling of the user's base power level.

And if you consider Goku's use of the Dragon Fist in his fight with Super 17 to be a ki-empowerment of his physical punch (rather than a separate energy attack and therefore something that Super 17 would have absorbed), plus the fact that Super 17 could take SSJ4 Goku's physical punches, then you have the argument for the Dragon Fist being an attack that attacks with over four thousand times the user's base power level.

Special shout-out though to the Kienzan:

Spoiler:

In the early Namek Arc, Krillin and Gohan's power levels were almost 1,500 (the fight where they lose the Namekian spaceship). While Gohan might have gotten to that point via a Zenkai from the Saiyan Arc, I take that number as a solid reference to what Krillin's full power was in the Saiyan Arc.

While we don't know how much Vegeta's use of the power ball lowered his power from its original 18,000, I still wouldn't peg it as low as 9,000 (no real reason aside from how easy it is to specify half and the fact that no one says so). So when Krillin (1,500) throws a Kienzan at Oozaru Vegeta (I'm pegging it at at least 90,000) and Vegeta still bothers to dodge it (rather than deflect it by, say, hitting it along its broad surface or just blasting it before it hits him), I take that as a loose indication that the Kienzan is at least a x60 attack.

Furthermore, Krillin's Namek Arc Potential Unlocked power is somewhere over 10,000 and should even be close to the 23,000 exhibited by Ginyu-in-Goku's-body. Considering how easy it is to say "over twenty thousand" as "over ten thousand" and the fact that that's not what was said, I wouldn't peg Krillin at over 20,000 though still close.

And we know that Vegeta expected Krillin to be of use in the fight against Frieza, even accounting for a transformation on Frieza's part. Krillin (approximately 20,000) having an attack worth at least x60 (resulting in an attack power around 1,200,000) would fit that. Especially when the over-one-million power of Frieza's second form is actually higher than Vegeta's expectations (to say nothing of the fact that it did work once, albeit only on Frieza's tail).

On the other hand, I don't peg Majin Vegeta's self-destruct as particularly powerful. SSJ3 Goku's Kamehameha (assuming he's capable of taking the form to full power) is theoretically enough to finish Kid Buu, and should be slightly more than x8 Majin Vegeta's base power. But Majin Vegeta's self-destruct couldn't even finish off the weaker Fat Buu (which should make it less than x8.

[LSSJGODSSJ4Gogeta]

Assuming the same base power level, the Dragon Fist. In GT, even as a SSJ4, Goku still uses a regular Kamehameha and the x10 Kamehameha, so the x10 Kamehameha being a separate thing (and as it says on the tin, ten times stronger) should be a thing. Considering the x10 Kamehameha does zilch to Syn Shenron but the Dragon Fist blows Omega Shenron (self-styled to be ten times stronger than Syn) to pieces, the Dragon Fist should be more than a hundred times the power of the Kamehameha. And according to the fight with Raditz, the Kamehameha is slightly more than a doubling of the user's base power level.

And if you consider Goku's use of the Dragon Fist in his fight with Super 17 to be a ki-empowerment of his physical punch (rather than a separate energy attack and therefore something that Super 17 would have absorbed), plus the fact that Super 17 could take SSJ4 Goku's physical punches, then you have the argument for the Dragon Fist being an attack that attacks with over four thousand times the user's base power level.

Special shout-out though to the Kienzan:

Spoiler:

In the early Namek Arc, Krillin and Gohan's power levels were almost 1,500 (the fight where they lose the Namekian spaceship). While Gohan might have gotten to that point via a Zenkai from the Saiyan Arc, I take that number as a solid reference to what Krillin's full power was in the Saiyan Arc.

While we don't know how much Vegeta's use of the power ball lowered his power from its original 18,000, I still wouldn't peg it as low as 9,000 (no real reason aside from how easy it is to specify half and the fact that no one says so). So when Krillin (1,500) throws a Kienzan at Oozaru Vegeta (I'm pegging it at at least 90,000) and Vegeta still bothers to dodge it (rather than deflect it by, say, hitting it along its broad surface or just blasting it before it hits him), I take that as a loose indication that the Kienzan is at least a x60 attack.

Furthermore, Krillin's Namek Arc Potential Unlocked power is somewhere over 10,000 and should even be close to the 23,000 exhibited by Ginyu-in-Goku's-body. Considering how easy it is to say "over twenty thousand" as "over ten thousand" and the fact that that's not what was said, I wouldn't peg Krillin at over 20,000 though still close.

And we know that Vegeta expected Krillin to be of use in the fight against Frieza, even accounting for a transformation on Frieza's part. Krillin (approximately 20,000) having an attack worth at least x60 (resulting in an attack power around 1,200,000) would fit that. Especially when the over-one-million power of Frieza's second form is actually higher than Vegeta's expectations (to say nothing of the fact that it did work once, albeit only on Frieza's tail).

On the other hand, I don't peg Majin Vegeta's self-destruct as particularly powerful. SSJ3 Goku's Kamehameha (assuming he's capable of taking the form to full power) is theoretically enough to finish Kid Buu, and should be slightly more than x8 Majin Vegeta's base power. But Majin Vegeta's self-destruct couldn't even finish off the weaker Fat Buu (which should make it less than x8.

Majin Vegeta not killing buu was plot convenience. It's strong enough to kill him, as even if you think buu>vegeta somehow, Vegeta's above gohan which means he'd kill buu wit hit. it's his regeneration, even with only a fraction for his body left and not disintegrated he got back to 100% with cheap regeneration.
It's like some got blown away and not disintegrated.

I mean piccolo was damaged himself, more so then vegeta and was 1/4th the power of raditz and made a attack stronger then raditz TWICE, and could still go on afterwards, he even healed afterwards right away. SO if he can make 2 attack over 4x his strength after training all day, and being beaten up to the point he's armless then vegeta's self destruction, which is all his ki being used has to be like minimum 10x his power level, which is above Gohan who's ki alone made Buu go to 50% the power he needed to revive. IDK why people think fat buu> majin vegeta but even if you think that his explosion is stronger then buu. I call buu surviving a plot hole or just luck of pieces of his body being blown away.

[Draconic]

Majin Vegeta not killing buu was plot convenience. It's strong enough to kill him, as even if you think buu>vegeta somehow, Vegeta's above gohan which means he'd kill buu wit hit. it's his regeneration, even with only a fraction for his body left and not disintegrated he got back to 100% with cheap regeneration.
It's like some got blown away and not disintegrated.

I mean piccolo was damaged himself, more so then vegeta and was 1/4th the power of raditz and made a attack stronger then raditz TWICE, and could still go on afterwards, he even healed afterwards right away. SO if he can make 2 attack over 4x his strength after training all day, and being beaten up to the point he's armless then vegeta's self destruction, which is all his ki being used has to be like minimum 10x his power level, which is above Gohan who's ki alone made Buu go to 50% the power he needed to revive. IDK why people think fat buu> majin vegeta but even if you think that his explosion is stronger then buu. I call buu surviving a plot hole or just luck of pieces of his body being blown away.

Somehow? As in Vegeta getting his shit kicked in and standing zero chance, to the point of killing himself just to finish Buu off? Buu is so far over Vegeta it's not even funny.

[Darkprince410]

Majin Vegeta not killing buu was plot convenience. It's strong enough to kill him, as even if you think buu>vegeta somehow, Vegeta's above gohan which means he'd kill buu wit hit. it's his regeneration, even with only a fraction for his body left and not disintegrated he got back to 100% with cheap regeneration.

A blast cannot kill Buu if it's not stronger than he is. Vegeta was nowhere near as powerful as Buu was once Buu became angry and started actually fighting back, after which case Vegeta was shocked as to how overwhelmingly powerful Buu was. Additionally, while witnessing the whole fight, Piccolo established that even if Goku, Gohan, and Vegeta all fought Fat Buu together while Super Saiya-jin 2, they'd stand no chance against him, meaning he could tell Buu was stronger.

If Vegeta or his self-destruction technique had actually been stronger than Buu, it would have killed him. It wouldn't simply have blown him apart, but would have actually killed him.