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.

Physiology
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 age.

Powers/Abilities
Chronians are able to halt and reverse time. They also can travel through time and space by using portals or teleporting.

Chronians can fire powerful beams of purple time-based energy from their hands. These time rays are very dangerous, as they can instantly age ordinary humans to a zombie-like state. They can also age To'kustars, Evolved Methanosians, and regular Methanosians to the point of crumbling to dust.

Chronians are stronger and more agile than ordinary humans.

Chronians are durable enough to withstand a Pyronite's fire blasts, a Petrosapien's projectile shards, and a Vulpimancer's tackles with no visible damage.

A Chronian's time powers grants them limited molecular manipulation abilities, allowing them to create illusions and mirages to fake their deaths.

A Chronian's time energy can become electrical, allowing them to manipulate and control technology and machines from any race, such as vehicles or clockwork gears.

Chronians are able to sense the ripple effect in time when a Chronosapien uses their time powers.

Weaknesses
Though very powerful, the Chronians' powers can backfire on them if misused. It would also seem that overusing their powers can both weaken them and speed up their aging process.

Eon's time rays are useless against anything diamond-related, such as Petrosapiens, since they do not age. They are also ineffective against gumballs.

Behavior
The Chronians appear to be very greedy with their space-time powers, as their once-beautiful world was ruined by this abuse in power.

Chronians also seem to be unaware of the full consequences of manipulating time and space, as they wound up stuck in another dimension in their haste to escape the effects of time.

History
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.