Trunks proved that, while not as powerful as Goku or Vegeta (given that at the time of their encounter during Dragon Ball Super, the two were wielding godly power), he is incredibly powerful in his own right. Trunks literally became a living, breathing senzu bean with the realization that he had the power to heal those who had been injured in battle. The reason behind Trunks’ lack of this ability in the anime is unknown, but it's likely that the showrunners instead decided to focus on the tragedy of his future world and what he was willing to do to save it, simplifying the narrative by removing the type of ability that tends to create plot holes down the line. In the corresponding Goku Black saga in the Dragon Ball Super anime, Trunks does not have healing powers either to quickly heal himself or others. Trunks successfully heals Vegeta, putting his father back into the fight to save his world and his entire universe. Once Trunks learns of his hidden ability, he rushes over to his father Vegeta, who is gravely injured after fighting Zamasu, and puts his powers to the test.

Trunks realizes in Chapter 24 that he has healing powers, bestowed on him by the Supreme Kai of his universe through a special ritual. Related: Dragon Ball Super Proves Vegeta Has Changed, And He's Never Going Back While Zamasu puts the beating on Goku and Vegeta, they have a secret weapon in the form of Trunks that keeps them in the fight. When the Z-Fighters get to the future, however, the power level of Zamasu is unmatched, as the villain enhances himself using Super Dragon Balls. Trunks, in response, goes back in time to retrieve Goku and Vegeta to bring them to the future and defeat Zamasu once and for all. Zamasu and his variant Goku Black have taken over Trunks’ future, bringing his world to its knees.

In Dragon Ball Super Chapter 24 by Akira Toriyama, Goku, Vegeta, and Trunks are fighting the multiversal villain Zamasu and are losing quite considerably. The incredible power Trunks wields is the power to heal at a remarkable rate.

The reason for his power discrepancy has everything to do with one specific ability he has in the manga that he doesn’t have in the anime. Trunks has been proven to be much stronger in the original Dragon Ballmanga than in the anime in reference to his epic future self.

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