Chronian

Chronians are a subspecies of humans capable of traveling through space and time. They come from an alternate version of Earth known as Chronia.

Appearance
Being a human subspecies, Chronians are mostly indistinguishable from humans except for their skin being pale white and brown marks forming around their eyes as they get older.

Abilities
Chronians are able to halt and reverse time, and can travel by means of teleportation.

Chronians can create purple glowing energy spheres for offensive attacks and activating the Hands of Armageddon. They can fire powerful time beams that can age organic beings to either a zombie-like state or the point of crumbling to dust.

Chronians are able to control clocks and vehicles without physically touching them.

Chronians possess enhanced strength, as evident when Eon threw Ben across a large distance while Ben's Chronian form broke free from some chains.

History
The alternate Earth known as Chronia was once a beautiful world until the Chronians ruined it in their greed to obtain more power over space and time. When this happened, they used their powers to place themselves in another dimension to escape the effects of time. However, this came at the cost of wounding up stuck there.

Eon, an alternate version of Ben Tennyson who had become corrupt and evil after something bad happened to his Omnitrix, had been traveling through various different timelines, enslaving their native version of Ben and turning them into his personal servants with the intention of becoming the one and only Ben Tennyson in the entire spacetime continuum.

Eon made his way to an alternate Earth to activate a device called the Hands of Armageddon before being captured by the original Earth Plumbers of that universe. Assuming him to be an alien, Eon was placed in cryogenic freezing but eventually broke out 200 years later and aged his guardian to near-death.

When Eon found that he was indeed too old and weak to activate the Hands, he set about capturing the timeline's native Ben with the intention of using his Omnitrix to turn the boy into a younger version of himself. This was because the Hands of Armageddon needed the energy of a younger being of his power to activate it. To ensure that Ben would permanently become a clone of himself, Eon also had to deactivate the Omnitrix's failsafe so that his DNA would completely overtake Ben's personality.

After multiple failed attempts, mostly due to interference from Plumbers, Eon was finally able to capture Ben, his cousin Gwen, and their grandfather Max. Holding them captive, Eon revealed himself to be Ben's future self, which Max admitted to. Eon then activated the Omnitrix, turning Ben into a younger Eon. Due to his powers over matter, Eon was able to retain his personality in the DNA sample that was collected in the Omnitrix. Upon succeeding in this goal, Eon seemingly wiped himself from existence.

Ben as Young Eon activated the Hands of Armageddon, but his human personality retook control when Gwen managed to reach Ben, prompting him to revert back to human. When Max deactivated the Hands, an enraged Eon returned and tried to exact his revenge. However, Ben as Wildmutt managed to send Eon crashing into the Hands of Armageddon, destroying it in a huge explosion of bright, glowing purple-colored energy, and inadvertently sending Eon out of that timeline.

Eon made his way to an alternate timeline inhabited by a version of Ben 10,000 (Ben's heroic future self) who could turn into Ultimate Ben and trick him into sending him to the Prime Timeline using Clockwork's time rays. He used the Prime version of the Hands of Armageddon and the Ultimatrices used by both Ben Prime and Ultimate Ben to cross over. However, his plans were foiled when Gen Prime immobilized his army using a magic spell and Ben Priem as Jetray destroyed the Hands, effectively ridding the Multiverse of the Hands forever and undoing Eon's actions.

Since his defeat at the hands of the Prime Timeline Ben Tennyson, Eon has abandoned his original agenda and resorted to attempting to rule the Multiverse with an iron fist by any means necessary.