Julia Freeman

"I am the scalding light. I am the flood that sweeps away sins. I am the word and cry of justice. I am Purity."

- Purity to Supergirl

Julia Freeman is a Kryptonian world killer. She has been seen by Kara in her visions as one of the world killers known as Purity and her world killer persona has now emerged, triggered by a combination of Reign's awakening and a car accident where she was crushed between two of them and has been captured by Reign to fully awaken Purity.

Biography
After surviving a car accident, Julia then discovered she had managed to survive this through her new-found abilities.

Later she had gone home, listening to some music in her house. Unaware of Supergirl and her team raiding her place, she was terrified when she saw them, and begged not to be hurt, but when threatened by Alex Danvers, who did not by any means trusted the world killer’s human side, it triggered Julia’s Purity persona. Purity had then taken down the agents of the D.E.O. but J'onn managed to arrest her.

Afterwards, she was sent to the D.E.O to be interrogated separately by both Supergirl and Alex, both of whom were hoping that they could gain more information on Reign and the other yet-to-be-identified world killer through Purity. But because they were asking her questions to which she does not necessarily hold the answers to, Purity simply contented herself in getting under the Danvers’ skin, evading and tauntingly re-directing the conversations with either of the sister to their own insecurities and vulnerabilities, to even openly mocking the part of herself that is Julia, saying that she was just "a mask that had to be worn" until the time passes for Purity and her brethren to emerge. She specially rattled Alex who, in turn, was needlessly and aggressively condemning towards the captive world killer and it did not take long for Purity to glean through and discern the root cause of the operative’s zealousness and acerbic conviction; that deep down, Alex was still hurting and to rid herself of that, she was taking her frustrations out on her powerful prisoner. Frustrations that Alex herself had a hand in the making and, deep down, Alex knows that presenting herself as a tough front before Purity wasn’t mitigating the former’s regret at any rate.

That rocked Alex to her core, forcing her to leave Purity’s containment area and trying to suppress her tears. Seeing how hurt her beloved sister was, Kara confronts Purity finally seeing the world killer for what she was from Alex's perspective - a thing dedicated solely for destruction. As Supergirl, Kara swears she’ll see to it that it would not come to that. Left at either side of the containment, she and Purity (who was rather pleased to have gotten inside her enemy's head) trade boasts and insults (Game of Thrones' Dothraki-style) in Kryptonese. At that point, Purity’s own beacon crystal to the Juru’s Fortress of Santuary suddenly activated in Winn's lab, cutting off all the D.E.O. establishment’s power grid and enabling Purity use of her sonic powers again. Using them to break free from her imprisonment and incapacitating Supergirl, the worldkiller proceeded to the said lab to collect her crystal. She then flew off after retrieval.

However, she was followed in the subway and forced into battle against Supergirl and her allies who, despite the sonic blockers that Winn crafted and provided them with, began to fall one-by-one before the world killer's raw might until Alex reached out to the part of her that is still Julia, apologizing that her stubbornness prevented her from acknowledging that. Reign then arrived after Julia's breakthrough and threatened Alex's life. Julia offered her life for Alex to be spared. Reign concedes to Julia’s offer, since the latter's retrieval was the former's priority (at the moment) anyway; she addresses her now-inactive kin as "sister", telling Julia that they will find together the third of their triumvirate, Pestilence, and become unstoppable once they do. And grabbing her, Reign then flew Julia away.

After Pestilence had become active, Purity came for her, glad they were together before they left for L-Corp to pick up Reign.

Personality
Julia is home a kind, caring, selfless and moral individual, as she pushed her friend Vanita, out of the way when she saw a car (moving out control) coming at them, despite knowing the fact that she could be killed. Julia can also easily be frightened, like when she discovered that Supergirl and the D.E.O. were in her home.
 * -|As a civilian=

As Purity, Julia is cold, cruel, sadistic, ruthless and aggressive, she was unfazed by Alex Danvers' threatens of being incarcerated for months, as she saw right through the latter's arrogant and tough demeanor (mainly due to her empathic powers) she also mocked Alex by stating that "you want me weak, because you weak, you had your chance of happiness, but through it all away, and now your just a broken little doll" (referring to a breakup with Maggie Sawyer; which is not entirely untrue).
 * -|As Purity=

Powers

 * Altered Kryptonian physiology: While normally her capacities are no greater than a normal human of her physical conditioning, once empowered, she is becomes able to perform a variety of otherworldly feats. Even more, Julia's Kryptonian physiology has been genetically augmented from centuries of experimentation by Kryptonian scientists. Due to this, her powers are naturally greater than any normal solar-powered Kryptonian. It is unknown if she is more powerful than Superman, but it is likely that she is just as powerful as him, as she has been on Earth for at least 35 years; the same number of years that Superman has spent under the Earth's yellow sun, but has augmented, much more potent powers, making Julia one of the most powerful beings in the multiverse.
 * Sonic scream: Like Siobhan Smythe, Julia can vocally emit a focused, high frequency sonic scream that is powerful enough to knock a fully grown Kryptonain feet away into a wall. She was also able to knock Supergirl unconscious with her scream; after analysis done by Winn, he confirms that Julia emits a specific sound frequency intended to be particularly harmful to (presumably normal) Kryptonians. That said, it is also probably just as effective against Daxamites, seeing how Mon-El himself reacted after he became recipient to the worldkiller's augmented vocal outburst in Julia's home. Her scream can also be used as a force projectile, as she was able to break down a whole train station just by screaming at it.
 * Sonic inducement/Sound projection: With a slight clench of her hands, Julia, is able to induce vertigo, vibration, and a sonic sound in her immediate vicinity, extending outwards omni-directionally in an expanding sphere-like fashion from where she was. She was able to shake and vibrate the whole D.E.O. facility, and cause anyone near her to feel the effects of a migraine, and have ringing in their ears. The effects of the ability even allow her to stun, explode, and push back multiple objects at once, and even stun normal humans, as shown when she almost knocked out Winn while using this ability.
 * Empathy: Julia says she is able to "see" into people, and is able to read peoples personalities, and look deep into their psyches - though it is unknown if this is merely perceptive insight on her part when she mentally profiles an individual she meets. Unlike a telepath, she cannot see into their minds, or read thoughts, but she is able to feel emotions, experiences, and personalities from people within a matter of minutes, just like she did to Alex Danvers, noting that the human was antagonizing her in captivity because of the emotional baggage that Alex was carrying (from her break-up with Maggie) and that belittling someone as powerful as a world killer, despite being human, was the agent's way of voiding her own vulnerability.
 * Super strength: Julia has demonstrated a high level of super strength, as she was able to break Supergirl's legs by slamming them into the ground, after contending with and eventually beating Supergirl in a one-on-one brawl, and managed to nearly choke her to death, as well as punch Mon-El into a stand, which shattered on impact. It is unknown if her super strength is as powerful as Reign’s, but from her demonstrations of super strength, she is likely stronger than Supergirl.
 * Flight: Julia has the ability of self-propelled herself through the air at tremendous hyper-sonic speeds. Though she has only been seen using this ability once, it is implied that she can fly at speeds as fast as Supergirl, and has been shown to be able to hover and levitate as another application of her ability to fly.
 * Invulnerability: Julia was able to take multiple punches from Mon-El and Supergirl, without being fazed. She was able to fly through a hard glass wall without showing any signs of damage as well. She also survived being crushed by two cars.
 * World killer link: The world killers appear to have a link with each other using Reign as a nexus point. This is evident as no world killers awoke until Reign did. Julia does not have children so this did not inhibit the development of her powers like Reign and only woke after Reign did.

Abilities

 * Expert combatant: Julia, as Purity, is shown to be a capable fighter. She was able to keep with Supergirl, effectively dodging streams of the latter's heat-vision at close range, and Mon-El in hand-to-hand combat - culminating to even beat them; Purity even succeeds in putting the former through a head-locked back-breaker move that damaged the other Kryptonian's legs and compromising her locomotion, rendering Kara virtually helpless and putting her out of the fight by the time of Reign's arrival.
 * Singing: Julia is adept at singing.
 * Multilingual: Julia is capable of fluently speaking English and after her awakening, Kryptonese as well.

Weaknesses

 * Split personality: Julia's full powers are not truly available to her own discretion. Apart from her invulnerability, only in moments of extreme stress can she access some of her other powers, and not at full capacity. Once her programming was awakened, as Purity, she has full access to her powers, but becomes completely unaware of it. Her separate persona as the World killer is completely void of all her past memories as Julia and upon reverting to her normal-self, remains completely oblivious to all actions as Purity. Though according to Purity herself, Julia is fully conscious even while the former is in control; the latter just doesn’t remember it when Julia’s conscience resurfaces.
 * Vocal cords: If someone is able to grip her throat tight enough, her vocal cords will be inoperable and she will not be able to scream.
 * Sonic dampener: This technology could dampen Julia’s sonic scream but due to her augmented physiology, it probably won’t dampen this power fully.