Promestein

Promestein is a powerful scientist with vast technology. In reality, she is an angel who devotedly follows Ilias’s cause without question, having created the chimeras at Ilias’s order. Despite being the Ninth Rank of the Hierarchy of Angels, Promestein is one of the leaders of Ilias’s army due to her vast knowledge of technology and command over the chimeras.

Although she makes a few appearances in Chapter 1, her name is not revealed until the middle of Chapter 2.

Promestein’s personality is very calculative in nature, showing no emotion in any of her appearances and speaking very little, other than to observe others and introduce herself. She does show some levels of sadism however, as seen when she lays siege to the Monster Lord’s Castle at the end of Chapter 2.

Biography
Promestein first appeared as Luka drags Alice out of the Haunted Manor, bringing supplies to Chrome to help her in her research, but finds out that she has left. She recognizes Alice as the Monster Lord then quickly leaves.

When Luka returns to Lily’s mansion at the Witch Hunt Village, Promestein is there, suggesting that she helped or supplied equipment to Lily for her crude experiments. She sees Luka, but leaves shortly after. Luka asks Alice if Promestein is a monster, but she isn’t able to trace any sort of monster blood or power within her.

In Grangold, Alice hypnotizes a female magic engineer to reveal how they detained the Queen Ant. She reveals that years ago, the same strange scientist woman, identifying her as Promestein, came to them and “gave humans fire” (advanced technology), and has been supplying it to Grangold over the years, but recently stopped coming. Later, Luka asks if Promestein is human, but Alice doesn’t think so either.

Luka then encounters the scientist again at Remina. At first, he assumes she lives there, but then realizes she may be involved in the massacre.

At the end of Chapter 2, after Luka revolts against Ilias, Promestein appears leading the attack on the Monster Lord’s Castle, revealing that the chimeras were all her handiwork. Luka yells that their defeat will never happen, until Granberia and Alma Elma receives smack-downs by Arc-En-Ciel and Hainuwele, respectively, as well as Amphisbaena, Tsukuyomi, and Rapunzel appearing on scene; the true masterpieces of the chimeras created and modified to exploit the weaknesses of the Four Heavenly Knights and the Monster Lord. Luka attempts to attack the mastermind, but Promestein dodges using Zylphe and explains that she had analyzed and is mass producing artificial Spirits. Alice reminds him that he’s not alone in this battle, and with angels and chimeras closing in from all sides, the angel who’s mass producing monsters, plus the one pulling the strings, they charge into the fray together.

After Luka manages to defeat Cupid, Valkyrie, and Archangel Ariel, Promestein calls out to Eden, the leader of the angelic forces, a failure. Alice then decides to attack Promestein; Arc-En-Ciel, excited, tries to step in, but Promestein stops her as there are already countermeasures against Alice and Luka. Alice punches, but Promestein, using the same barrier magic from Grangold, manages to seal Alice, much to Luka's horror. Promestein explains she had studied a seal called the Six Ancestor's Great Seal, used to seal Alice I (First) as well as the six ancestors of all monsters, and successfully reproduced it. Promestein then attempts to use her countermeasures on Luka; the power of the Four Spirits have completely faded. She then explains that she managed to develop another seal that blocks out the nature of elements over the entire world. A Chimeric Beast attacks just to prove her point, effortlessly avoiding his dwindled Lightning Sword Flash and even driving through his parry. Promestein then offers Luka a choice of surrender or refusal.

If Luka surrenders, he is taken to the Drain Lab to be raped for all eternity.

Refusing, Amphisbanea is ordered to sever Luka's limbs, but a large vibration interrupts her; its Tamamo with the unsealed Giganto Weapon. It manages to annihilate most of the chimeric forces, but is easily defeated by Arc-En-Ciel. Promestein is surprised at the beast's resurrection, commenting that she didn't expect anyone else to have the knowledge of chimeras. She then explains to Arc-En-Ciel about how powerful the Giganto Weapon is if at full power, and then tells Luka that nothing can stop her five top chimera, dubbed Next Dolls. orders the Castle mopped up, but Tamamo steps in, noting that the chimera forces are mostly comprised of beast creatures. Her aura alone is enough to terrify the Chimeric Beasts; Promestein orders a withdraw as they already have accomplished in weakening the two most threatening monster forces, much to the dismay of the Next Dolls. Luka charges after Promestein, ignoring Tamamo's warning.

Luka then heads to Remina, where a strange girl (Black Alice) leads him into Promestein's secret laboratory. Promestein is a bit surprised, along with a young Alice appearing, revealing to have partially broken the seal using magic she had learned from Tamamo. Promestein takes on her foes weaker forms and then transforms into a seaweed-like monster, boasting that it once belonged to an ancient creature. Alice manages to hit Promestein, stating that her experimentation resulted her becoming monster, but Promestein continues boasting During the battle, Luka and Alice aren't doing so well until Luka suddenly enters Serene Mind despite Undine being sealed. Promestein resorts to using Zylphe, but Luka is still capable of reading her flow, which Promestein calls nonsense.

After being driven back, Promestein attempts to inject herself with a syringe, but Black Alice appears and stops her, stating that it is too early to use that "White Rabbit" injection. Promestein then disappears afterward.

Promestein then awakens in the Drain Lab, having returned to normal and recovered from her battle injuries. There, she meets the members of her inner circle: La Croix, Laplace, and Lucia. Promestein reports that even though the Monster Lord and Fake Hero have been weakened, they are still not completely powerless, and that Black Alice is aware of the "White Rabbit". She then notes that herself and her subordinates are all from different races; Angel, Monster, Machine, and Human, respectively; and they all share one thing in common: they are seekers of truth, overcoming any obstacle in their way including a god while recruiting other truth-seekers. Promestein then orders La Croix to not let anyone near a device and Laplace to gather energy for what is to come, and Lucia then leaves for her hometown as a "messenger of slaughter and destruction". Laplace cannot fathom why Lucia cares about a village in the middle of nowhere, but Promestein responds that she is going to destroy it; Laplace thinks human thoughts are too irrational, which is something to Promestein's liking. All four then part ways, but the very same Cupid arrives momentarily and discovers the Drain Lab and goes to report to Eden.

Promestein
''“An angel who studies biology and technology that serves Ilias. Though she is an angel of the ninth circle, she was given a special mission by Ilias. Her original body was that of a normal angel, but she has since transplanted an ancient seaweed that she spend generations researching. She seems to have fairly high prowess for combat.''

''The original reason she had for going against the Goddess’s will and studying science is not known. It is only known that she was imprisoned as a criminal angel before Ilias gave her an important mission. A very strange existence among the angels, her fellow angels refer to her as a Heretic sometimes.”''

First Battle
Warmth

Softeness

Pressure

Suction

Tenderness

Wind Spirit Summon

Temperance

First Battle
A very difficult fight, hence she is being one of Ilias' right-hands. She can dish out a lot of damage, making Meditation a necessity. Alice will help to some extent, but she is not as powerful as she was before.

After getting Luka's health dangerously low, he will enter Serene Mind, granting high avoidance and costing now 2 SP instead of 4. However, Temperance, which occurs right after Wind Spirit Summon, will still hit him,so guard is necessary. The rest is straightforward.

Promestein
"Research like that is complete heresy. There’s some use for it but… …Excuse me, you don’t need to hear about that. I, the pure Ilias, shall guide you. During this fight, you should regain your serene state of mind. Once you do, make sure to never lose it. With that, you’ll be able to avoid most attacks… But if they hit, they are painful, so always keep an eye on your health. In addition, after she summons the wind spirit, she will use a powerful attack. Make sure to guard if you wish to survive it. Since your opponent has a large amount of health, expect a long fight. Keep an eye on your SP, and make sure you always have enough to recover and keep your serene state. Now go, oh brave Luka. Don’t hesitate to beat that great sinner to a pulp."

Trivia

 * Her name is a portmanteau of Prometheus and Frankenstein. This references her tendency in-story to “gift” humans with arcane knowledge in the same way Prometheus gifted humans with fire, along with her and Frankenstein both being “mad scientists” who try to create life. Her naming can be considered somewhat ironic, as both Prometheus and Frankenstein are characters that defied the gods.
 * This can also reference Marie Shelley’s full title for the original Frankenstein: “Frankenstein; or The Modern Prometheus”.
 * She mentions that she originally gave humanity fire, like the mythical Prometheus did, suggesting that at some point in the past she may have been more supportive of humanity than she seems to be now.
 * Her angel wings and halo seem to be translucent, as opposed to the other angels revealed so far. What this means for her or her character is yet to be known; it could hint at her ability to disguise as a human, though it is still uncertain whether this is exclusive to her.
 * Much like Ilias, Promestein’s motives have yet to be revealed, besides being Ilias’s subordinate.
 * Calling Promestein the main antagonist of Monster Girl Quest wouldn’t be far off if it weren’t for Ilias’s involvement, as she is the only main antagonist to have actually performed evil actions directly in the game, from Chrome and Lily’s experiments over the Chimera Dryad in the Forest of Spirits and the Grangold incident to the siege on the Monster Lord’s Castle. She may have also been involved in the Slaughter of Remina, which would explain the massive amount of chimeras which now reside there, however there is no definite proof, as Promestein may have simply decided to use the decimated town as a laboratory or gathering-point, seeing that it is not certain the chimeras even existed at that point in time.