How could/should Black and Zamasu be defeated?

[Lionel]

Bulma's mother retaining her looks is an unexplained aberration. If I had to guess, it likely has to do with her genes and possible life style choices (compared with Bulma who was shown to be a smoker in the Buu arc and has been in some fairly stressful situations over the course of the manga). Some people just look naturally young over the course of their lifetime despite being chronologically older.

I would dispute that the manga's contents supersede Toriyama's word. Before you criticise me, just keep in mind that Toriyama isn't exactly known for being thoughtful and consistent with his writing. He's a spontaneous "fly by the seat of your pants" type of writer who often creates things in the moment (even though I do think he might have some rough bare bones of a storyboard written down or thought of in his mind). Some of his comments are subject to scrutiny and possible contradiction like his belief that Super Saiyan was only a 10x multiplier. If we took his word literally then Goku getting the upperhand against Freeza after transforming wouldn't make sense because Goku had already attempted a Kaioken with a higher multiplier than 10 and it failed to do anything more than char Freeza's hand while at 50% of his maximum strength.

I think by the time Dabura and Babidi showed up, Trunks had already become powerful enough to show up on their radar, so to speak. By the time the Future Trunks arc began he was already pressuring a post-U6 tournament SSJ3 Goku in the Super manga.

There's corroborative evidence to prove that the cyborgs are immortal -- not just with #18's profile, but Gero's as well.

Artificial Human No.20
His true identity is Doctor Gero
History:Known as a mad scientist, he was employed by the Red Ribbon Army. Even after the army’s destruction, he immersed himself in developing artificial humans in order to get revenge on Goku.
First Appearance: chapter 337
Special Characteristics: This is Doctor Gero’s form after he restructured himself into an artificial human to gain eternal life. Though he’s stronger than No.19, he’s still considerably inferior to No.17 and No.18. Even so, Doctor Gero is truly a genius, familiar with everything from cutting-edge mechatronics to biotechnology.

But even the manga never claimed the androids were immortal, especially since they can be killed, and give how 'right' Gero tends to be, I take what he says with a grain of salt.

And Toriyama isn't writing by the seat of his pants in interviews, like him knowing that he retcon Buu's origins.

That's because immortality isn't equivalent to being utterly impervious to death. A precedent does exist for immortals having not only their bodies damaged, but being completely atomised and killed in the process. Also, it's not just the quote given by Gero, the Daizenshuu corroborates this information. The cyborgs have been shown to have retained their appearances for decades in spite of being chronologically older than Gohan (they were already what appeared to be teenagers/young adults when released). In fact, they're probably actually closer to Goku's age than Gohan's since they would have likely been born before the end of the original DB.

Toriyama doesn't remember quite a number of the details from his own manga because it ended 20 years ago. The man originally couldn't even remember that SSJ2 and SSJ3 existed, iirc. He wasn't consistent or accurate back when he was writing the series so how he would be now?

[HeroR]

No, that is your assumption that immorality doesn't mean impervious to death in the series. Immortality is a specific thing in Dragon Ball, meaning never dying, which was why Freeza and Vegeta wanted it. No one in the series has never been described as being immortal. The closest is Gero's, 'I want to live forever', and he died soon after. Meaning, it's not to be taking seriously.

Zamasu calls himself an immortal and when asked how to kill an immortal, Beerus basically said, 'beats me'.

[ryou766]

Is it possible that Zamasu's immortality is similar to Hidan's from Naruto? You can decapitate his head, remove all his limbs and he'll still be alive.
[spoiler][/spoiler]
For those unfamiliar with Hidan, it had to take for him to be deeply buried underneath the ground to be defeated.

[Krillin1994]

Zamasu will be beaten by killing the U10 God of destruction.

[HeroR]

Is it possible that Zamasu's immortality is similar to Hidan's from Naruto? You can decapitate his head, remove all his limbs and he'll still be alive.
[spoiler][/spoiler]
For those unfamiliar with Hidan, it had to take for him to be deeply buried underneath the ground to be defeated.

Hidan couldn't regenerate. He kept all his injures but didn't die. Zamasu heals instantly when damaged, as seen when Trunks impaled him.

Zamasu will be beaten by killing the U10 God of destruction.

Isn't that assuming that the bond between the God of Destruction and the Kais is stronger than any wish for immorality? And if U10 God of Destruction is as strong as Beerus, who exactly is going to kill him? Beerus? Because of the Gods of Destruction are not allowed to fight each other.

[Alruneia]

I kinda hope Zamasu's defeat comes from a technicality. He's immortal, so his death needs to happen because of something not directly related to him getting killed. That's where Universe 10's God of Destruction might come in, but I think it'd be even better if his life force is bound to Black. By that, I mean that Zamasu is impervious to damage as long as Black lives, but if Black is killed, Zamasu still dies. In the final battle, that could lead to Rosé Black being outmatched by Goku and/or Vegeta, so Zamasu rushes in to help, but is intercepted by Trunks, who holds him off as he gets increasingly desperate to bail Black out. It'd actually be a pretty intense battle to watch, because of the "it's so close" feeling.
If that's not happening, then they might have to Mafuba him instead. Bringing back the Evil Containment Wave would be interesting for sure.

[Anime Kitten]

I kinda hope Zamasu's defeat comes from a technicality. He's immortal, so his death needs to happen because of something not directly related to him getting killed.

Come on! Zen'ou button, banish Zamasu outside of the Omniverse, yadda yadda... That's still what I'm going with for what could happen, although I don't necessarily believe it will.

[Lionel]

No, that is your assumption that immorality doesn't mean impervious to death in the series. Immortality is a specific thing in Dragon Ball, meaning never dying, which was why Freeza and Vegeta wanted it. No one in the series has never been described as being immortal. The closest is Gero's, 'I want to live forever', and he died soon after. Meaning, it's not to be taking seriously.

Zamasu calls himself an immortal and when asked how to kill an immortal, Beerus basically said, 'beats me'.

I don't know what else to say to you. I've provided clear-cut evidentiary material not only from the Daizenshuu but the manga as well. You haven't really been able to reinforce this point besides argue that these other characters weren't actually immortal while claiming a no-limits fallacy for Zamasu. Just like with the assertion that strength limitations have been reached for a character, the parameters which define immortality are flexible and not static. Zamasu's immortality happens to resemble Buu's and Garlic Jr's immortality moreso than Roshi's or the cyborgs', but that doesn't necessarily make his longevity absolute, as was the case with Buu whom we know can be killed despite his incredible regeneration.

I've looked over episode 58 and I can't find where Beerus mentions this. Could you please provide a direct pictorial reference to the quote?

[Steven Bloodriver]

Either by a baby Pan or a fusion between Future Gohan and Future Trunks.

Or even by the Para Brothers.

[Barunks]

I'm calling it right now, Zamasu is only "immortal" as long as Black is alive. Then like a video game as soon as they take out black Zamasu should be easy pickings.

[Alruneia]

I'm calling it right now, Zamasu is only "immortal" as long as Black is alive. Then like a video game as soon as they take out black Zamasu should be easy pickings.

Basically a shortened version of what I tried to say.
I seriously am hoping for something like this. Adding it is pretty much guaranteed high tension, especially with Zamasu's following desperation to keep Black alive.

[generalred3]

I'm calling it right now, Zamasu is only "immortal" as long as Black is alive. Then like a video game as soon as they take out black Zamasu should be easy pickings.

Maybe because Goku Black is the God of Destruction of that universe. And to beat Zamasu they have to kill Goku Black. Lol, as of now thats my guess. Who knows

[sophitia]

Zamasu : Have Buu absorb him.

Black : Call Chichi Black.