Zamasu B and Gowasu B arrived in Universe 7A only to see a strange machine to land. They saw Beerus A, Whis A, alongside Goku A, Vegeta A and several others scrambling over the machine. They watched as the machine opened revealing a stranger who looked similar to one of the boys. They watched Goku A dissapeared and then returned, feeding a strange bean to the stranger.

They landed as Goku caught a punch from the stranger, Gowasu B bowed “Lord Beerus A we wish to speak with you and… Trunks, the time traveler. You are lucky, you are one of the few allowed to use that time machine by Chronoa. Because there are an infinite number of your timeline in existence. Chronoa decided that it was easier to compensate for you then to stop every version of you.”

Future Trunks saw the earrings on Gowasu B’s ears “Those were the ones I saw on Goku Black! He also had a ring similar to that one you are wearing! He hated mortals!”

Zamasu B stepped forward “Then he must be stopped, he is abusing the powers of the Supreme Kais. That must not be allowed.”

Future Trunks frowned as he pointed to Goku A “He looked like but was completely different from Goku in personality. Still we can’t go back there, the ship only had fuel for one trip.”

Vegeta A shouted “Your ran away! Don’t you want revenge!”

Bulma A stepped forward “Don’t criticise him like that. He surely did his best!

Goku A asked with a goofy smile “So what type of fuel did you use?”

Future Trunks frowned “Blue Electric Liquid No.15.”

Bulma A turned to him “Blue 15. We are developing that energy right now! Even if I use all my machines it would take a day to draw that much energy.”

Future Trunks eyes lit up “That would be great! It took almost half a year to get enough for one trip.”

Zamasu raised a hand “I will assist you on this trip if that is permissible.” Gowasu nodded in approval.

Vegeta crossed his arms as Bulma A ran off to begin her work “I hope you don’t get in our way.”

Zamasu B and Gowasu B mediated for most of the day until they noticed that Kaioshin and Kibito had both arrived. Kibito A frowned as he explained “We received a message from Lord Zuno. He informed me that a god from Universe 10A named Zamasu was asking about the Super Dragon Balls, inquiring about Son Goku and asking if it was possible for a god to switch bodies with a mortal.”

Zamasu B took a deep breath “So my counterpart is behind this. I only met him once but he seemed to hate mortals for some strange reason.”

Bulma A walked out carrying the tube of energy with the help of two smaller people. Whis and Beerus A frowned “We will investigate Zamasu A in the meantime.”

Bulma filled up the machine, Trunks, Goku, Vegeta, Gowasu and Zamasu squeezed into the Time Machine. They arrived above the ruined future, countless ruined buildings as far as the eye could see. They landed and they all hopped out, Goku looked like he was going to vomit.

Future Trunks looked at him with concern “Will he be alright?”

Goku A winced “Looking out the window made me sick.”

Vegeta A turned to him “Are you a child?” He then turned away “We are wasting time. Let’s find this Goku Black.”

They began walking away from the time machine, they noticed a ki coming from a nearby mountain. Zamasu B looked to Gowasu B “May I go and investigate.”

Gowasu B nodded “Very well, if you get into anything you can't handle return here.”

Zamasu B flew into the distance at incredible speed, bumping into Goku Black on the way. Goku Black frowned “Who are you?”

Zamasu B glared at him “I am Zamasu B and you must be Goku Black, a version of Zamasu A that stole Goku A’s body.”

Zamasu B kicked Goku Black in the gut then hammered him towards the ground. Goku Black was barely able to get up before Zamasu B kicked him in the gut sending him to the ground. Goku Black growled as he stood up “What are you talking about who is Zamasu A! Is there a B somewhere!”

Zamasu B growled “I am Zamasu B!” He was about to blast him only to have to cancel the blast as he dodged a kick from someone else.

Zamasu B turned to see a green figure in the same clothes as him with a white mohawk identical to him standing next to Goku Black. Goku Black stood up as he was healed “It seems we will have to do it. He is far more powerful than us.” Goku Black took of his earring and put on his other ear, the two flew to each other and merged into a single green figure with white hair sticking up like a Super Saiyan.

The new figure smirked “I am God Zamasu.”

God Zamasu leapt at Zamasu B, Zamasu B blocked their punch and kicked them in the face “You really don’t get it. You can’t win.” He blew a hole through God Zamasu only for him to regenerate.

God Zamasu laughed “You can’t beat me, I am immortal.”

Zamasu B powered up to his full power, sending God Zamasu hurtling back by the force of his energy. Goku A and Vegeta A arrived alongside Gowasu B and Future Trunks. Zamasu B blasted God Zamasu into ash only for him to regenerate again, Zamasu B sighed “Give up before I have to destroy you.”

God Zamasu shouted “How dare you mock us!” He formed multiple blocks of Katchin and threw it towards Zamasu B who causally deflected each one with ease.

God Zamasu growled “How are you this strong! You aren’t even a Supreme Kai!”

Zamasu B roared “I lived my entire life in the realm of demons. I am a Makai, sent down there because I was supposed to be evil! Yet I didn’t want to be, because that every demon wanted me dead and multiple attempts were made! I had to fight every day for my life and grew strong because I had too! I trained, fought and killed other demons until not a single one would dare raise a finger against me! I owe Gowasu everything for giving me a chance and I will not fail him!”

Zamasu B continued to pound against God Zamasu, Zamasu B frowned as they seemed to split in two. He cut them in half with a ki blade only for them to form into God versions of Zamasu, he cut them into pieces and they formed into twenty versions of God Zamasu.

Zamasu B took a deep breath before erupting with power, his body grew more muscular. His clothes changed to a gray and violet coat, a deep blue undershirt beneath it. He also had a pair of dark blue baggy pants. His hair became long and spiky, flowing down his back. At that exact moment Chronoa appeared “What’s happening?”

Chronoa growled at Zamasu B “Another Dark King.”

Zamasu B whose voice had deepened spoke “I am the Dark King Zamasu. I’m sorry for telling you Gowasu but I hated this part of myself, I have tried to hide it. Still I cannot allow this monster to threaten all of reality further.” Gowasu and Chronoa watched in shock as the Dark King Zamasu formed a black ball in his hands and sucked all the God Zamasus into it. He then crushed it out of existence along with all the God Zamasus.”

Zamasu bowed in front of Gowasu “My greatest apologies for keeping this from you. I will leave your teaching, you can’t be the teacher of a being like me anymore.”

Chronoa was about to speak but Gowasu shook his head at her “You saved everyone living thing here. You are perfect candidate for my position, return to my home planet and continue your training my successor.”

Zamasu bowed “Yes, my lord. I will.” Chronoa was stunned as all of them left to head back to the past, that a Dark King of the Demons would be so subservient to a Kai. Meanwhile in the time machine Goku A complaining that he didn’t get to fight only to get smacked on the back of the head by Vegeta A.

Author's Note

Zamasu is the Multiverses' Dark King. Now Power Levels

Goku Black: 500 Duodecillion
Scale: Multi-Universal

Future Zamasu: 50 Duodecillion
Scale: Multi-Universal

God Zamasu: 200 Quattordecillion
Scale: Multi-Universal

Zamasu B: 5 Duoviginitillion
Scale: Multiversal

Dark King Zamasu: 500 Quinviginitillion
Scale: Multiversal