To add to that, Darkstar has become a powerful mage in his own right.
In a frightening way, The Faction defeating Animo's mutants rather quickly.
Ben giving a "The Reason You Suck" Speech to both Carl Nesmith and Will Harangue after all the stuff they pulled on him.
Ben's return as Feedback and using the DNA repairing part of the Omnitrix to fix Malware.
Ultimos gets a big moment in the start of season 3 after getting his powers back by going All Might on the monster that the Incurseans brought with them.
Ben turning into Wyvurn, an S-Class Alien. Everyone was shocked with how fast Ben was able to power through with it and defeat the Forever Knights.
The fic's version of Nyancy. In "Omniverse", all she could do was manipulate cats and was a complete joke. Here, she is turned into a Youkai and proves a credible threat, even manages to escape.
The very brief scuffle between the Bens of Earth 1 and Earth 23 occurs, as Ben 10 is easily able to disable Ben 23 in his Vaxasaurian form with little effort as Four-Arms.
Kevin of Earth 23 absorbs and later fought with the force of an explosion's fireball and shockwave.
The battle against Vilgax. Especially given he is still as powerful as ever despite being a Handicapped Badass with a lot of faulty cybernetics.
Unlike in canon where it knocked him down, Vilgax takes the Techadon Disapator cannon blast head-on and then crushes it with his bound hands...and the blast was enough to free him and defeat everyone.
Vilgax then recruits SixSix, SevenSeven and EightEight and goes back to his home planet to fight off the invasion personally.
