Grace Parker


 * For her Worldkiller personality, see Pestilence.

Grace Parker was a Kryptonian Worldkiller known as Pestilence. In the 31st century of an erased timeline, Grace was also known as Blight. Because the Legion altered the timeline, she died in 2018 and never became Blight.

Early life
She was one of the three genetically engineered Kryptonian Worldkillers, along with Reign and Purity. In the wake of Krypton's destruction, she was sent to Earth as an infant to grow strong and awaken once Reign was ready. Her pod presumably landed on Earth around 1989, the same time as Reign.

At some point, she was adopted by an unnamed woman, who named her Grace Parker. Grace implies she was raised in a religious home. Growing up, she had a close, loving relationship with her adoptive mother, who raised her to believe that being a good person was its own reward.

Grace graduated top of her class at the Metropolis University School of Medicine. Afterwards, she became a doctor at National City General Hospital, practicing emergency surgery.

Death
After Supergirl and the Legion found the Worldkiller Fortress, they fought. The Worldkillers were winning until Purity, controlled by her human form, turned on them. Pestilence killed her but not before being killed by Purity herself. After her death, her and Purity's powers were absorbed by Reign who escaped after the fortress collapsed.

Erased future
According to Mon-El, in the 31st century, Grace has evolved and became Blight who killed many people across Earth and countless other planets. The Legion traveled to the present while she was still Pestilence to prevent her evolution.

Personality
Unlike the other Worldkillers, Grace Parker did not have a split personality. She did have two people living inside one body, however, they just happen to be similar people.

As a civilian, Grace gives out an outward show of empathy, but she was really enjoying hurting people. Once she found out about Pestilence, she was overjoyed, and started infecting others in her human form. It seems to be possible because the two may have made an agreement in the mind, however, Grace is also shown to be willing to give her life for her alter ego, Pestilence, as she stated that Grace gave up and shriveled without a sound.

Powers

 * Altered Kryptonian physiology: Like her counterparts, Grace’s powers come from the Fountain of Lilith in the Valley of Juru. She was exposed to the waters of the fountain which gave her the ability to produce her own power source rather than relying on a yellow sun to power her. Through further genetic experiments, her powers were increased beyond normal Kryptonian limits as well as altered so unlike Reign, they don’t follow the patterns of normal Kryptonians.
 * Extended longevity: According to Mon-El; after 1000 years, Grace will eventually evolve into "Blight", implying that she doesn't physically age or she does so, but at an extremely slower rate.
 * Worldkiller link: The Worldkillers appear to have a link with each other using Reign as a nexus point. This is evident as no Worldkillers awoke until Reign did. While holding hands or in close proximity to each other, they amplify each others’ powers, and can fire off a powerful blue blast.
 * Dark Magic: As a trinity, the worldkillers can use dark magic that is powerful enough to cause an eclipse for long enough to destroy all life on Earth.
 * Flight: Grace has the ability of flying 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.
 * Super strength: Grace has demonstrated a high level of super strength, as she was able to fight Supergirl and Mon-El at the same time. 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.
 * Invulnerability: Grace was able to take multiple punches from Mon-El and Supergirl and still being able to fight back. She has managed to take a punch from Reign who is implied to be the strongest Worldkiller.
 * Pestilence inducement: As Pestilence, Grace can spread some kind of contagious virus that can kill any living thing she comes into contact with as seen when dozens of pigeons fell dead from the sky, when people at city hall started having nose bleeds before collapsing and when a plant immediately died upon being touched. According to Mon-El, it was 100% fatal.
 * Retractable claws: As Pestilence, Grace can grow her nails into yellow claws, sharp and dense enough to pierce Supergirl's invulnerable skin, and presumably any other being. Her claws can also induce pestilence when she grows her nails upon physical contact. Her nails are retractable, and can reform to normal size.
 * Evolution: As Pestilence, Grace can "evolve" into more powerful and potent forms of herself, including turning into diseases and creating new ones. As mentioned in the 31st century, Grace had evolved into a most powerful known form of herself, Blight.

Abilities

 * Expert combatant: As Pestilence, Grace is able to show skills in close-range fighting as shown when fighting Supergirl but was bested, implying she is not as skilled as Reign or Purity, both who have been able to gain the upper hand on Supergirl. She was able to defeat Mon-El and Imra Ardeen.

Weaknesses

 * Kryptonite: Like all Kryptonians, even while empowered, Grace is vulnerable to the exposure of Kryptonite, a radioactive mineral from her home planet Krypton. Depending on the nature of the said Kryptonite, it will cause a different and adverse effect on her. Due to the augmentation of her physiology, much more is required to sufficiently weaken her.
 * Green Kryptonite: Green Kryptonite not only physically hurts Grace, but weakens her physical attributes, leaving her vulnerable to weapons and anything in general that can kill a normal human; presumably, if she is exposed to it severely for too long, it will kill her. Though she is more resistant than normal and unaltered Kryptonians so more Green Kryptonite is required to weaken her.
 * Forcefields: Pestilence was unable to escape Imra’s force field when she was contained in one.
 * Imra's virus: The first time Supergirl and Imra fought Pestilence, Irma contained her in a forcefield and injected her with a virus that started to kill her before Purity showed up, her presence apparently healing her.

Equipment

 * Pestilence suit: Grace wears a protective suit as her super-villainess alter-ego, Pestilence.

Erased future equipment

 * Blight suit: Grace wears a protective suit as her super-villainess alter-ego, Blight in the 31st century of an erased timeline.

Supergirl
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Behind the scenes

 * In the DC comics, the Blight is a nomadic race of techno-organic beings, who assimilate new races in search of immortality, but turning everyone into perpetually decaying techno-zombies in the process.
 * Pestilence's DC comic counterpart may be Perrilus who was a Worldkiller from the Supergirl New 52 comics who also had the same abilities to create plagues and diseases.