Editing Future Zamasu (section)

==== "Future" Trunks Saga ====
In the manga, while Goku Black was annihilating the mortal population in Future Trunks’ timeline, Future Zamasu used the Time Ring to explore the other parallel timelines. He discovered no significant obstacles to their plan. With Earth’s population nearly extinct, Future Trunks traveled back in time and returned with Goku and Vegeta.

During their first encounter in the anime, as Goku and Goku Black began fighting, Future Zamasu appeared beside Black. Reminding him of their agreement to allow Zamasu to kill Goku, he joined the battle. Future Trunks intervened to even the odds, but Zamasu’s immortality allowed him to heal instantly from any injury, including a stab wound from Trunks. Goku and Trunks were eventually overpowered by a combined attack from Zamasu and Black. Just as Zamasu and Black were about to finish them off, Vegeta intervened. Though he quickly fell unconscious again, his interference allowed Goku and Trunks to escape in their time machine.

Later, Zamasu and Black awaited the return of Goku and his allies at their cabin. They discussed their strategy and the importance of Goku Black growing stronger by adapting to Goku's fighting style. Future Zamasu suggested killing Goku slowly to maximize Black’s growth. He also offered Black the chance to become immortal, but Black declined, content with his current power.

When Goku, Vegeta, and Trunks returned to the future for the second time, Zamasu and Black confronted them immediately. Future Zamasu was shocked but intrigued when Goku revealed they knew their plan. He then listened as Goku Black corrected Goku’s understanding, explaining that Black was another version of Zamasu who had taken over Goku's body.

As the battle continued, Zamasu and Black recounted their history: how Goku Black killed Goku and his family, traveled to the future, killed Gowasu, and joined forces with Future Zamasu. Future Zamasu used the Super Dragon Balls to gain immortality, and the two destroyed them afterward. An enraged Goku attacked, but Future Zamasu’s immortality allowed him to endure.

The fight grew more intense when Future Trunks unlocked a new Super Saiyan form and fought Black evenly, surprising both Zamasu and Future Yajirobe. Seeing the struggle, Future Zamasu stepped in to help Black, but their combined efforts were repelled by Trunks’ newfound power. This allowed Goku and Vegeta to retreat, knowing they would return later.

In the manga, the timeline of events differs slightly. Future Zamasu first appeared to rescue Goku Black from Vegeta and healed him, giving Black a near-death power boost. Despite being considered a minor threat by Goku and Vegeta, Future Zamasu’s immortality and divine powers allowed him to keep fighting. He revealed his immortality after Goku suggested they surrender and undo their plans with the Dragon Balls, which he had destroyed.

As the battle raged on, Future Zamasu and Goku Black decided to merge their powers. They fused using the Potara earrings to become Fused Zamasu, combining Future Zamasu’s immortality with Goku Black’s strength. This fusion resulted in a mutated form due to the mix of immortal and mortal essences. Despite their combined might, they were eventually defeated after a series of intense battles, culminating in their erasure by Future Zeno.

In the aftermath, Whis intervened by traveling back to a point before Future Beerus' death in the timeline and warning him about Future Zamasu. This action created a new timeline, one free from Future Zamasu’s tyranny.