Heaven

Heaven is the final area of Monster Girl Quest, home to the Angels and where Goddess Ilias resides and watches over the world from. This is where the final battle against Ilias and her commanders is fought.

History
Apon Luka entering Heaven (through Heaven's Gate), Seraphim Eden confronts him. Searing with anger towards the son of Lucifina, she attempts to "imprison" him within herself so that his "heretical soul" would never reincarnate, but is ultimately defeated by Luka and Alice.

Proceeding further into Heaven, Luka and Alice encounter Promestein. Promestein reveales Ilias was absorbed by Black Alice, who had injected herself with the White Rabbit drug. The "fusion of the Dark God and Ilias creating the ultimate existence!". However, unbeknownst to Black Alice, Promestein created a second White Rabbit optimized for herself. Promestein pierces her neck with the syringe and injects the White Rabbit into herself, transforming her. However, Promestein states that Black Alice is still stronger than her. But if she were to absorb Luka, the son of one of the first angels created by Ilias, Lucifina, the holy-dark fusion would ascend her to Black Alice's height. And with that power, she would defeat Black Alice and rule herself. However, this would never come to pass, as Luka and Alice strike down Promestein once and for all. And while melting away, she declares all of humanity as her successor, believing that their thirst for knowledge will eventually surpass Promestein's work and research.

Proceeding further, Luka and Alice encounter Black Alice. And after a feirce fight, Black Alice pushes her power "past the critical point", causing her body to endlessly expand at an explosive rate. And if not defeated, she threatens to consume the world. However, Luka and Alice strike down the former Monster Lord once and for all, Alice declaring "You hold nothing now. Now vanish into the darkness of history."

But while Black Alice's body disintegrates, Goddess Ilias rises from the mass of flesh, revealing that Promestein's and Black Alice's betrayal was all part of her master plan to become the ultimate deity herself. As Ilias could not directly integrate with dark energy, she required Black Alice to devour her, and then for Luka to defeat her, freeing Ilias. And with her newfound power, she would be able to wipe out all Monsters, including the unsealed Dark God Alipheese and the Six Ancestors.

And so, with the weight of the world on their shoulders, Luka and Alice rush into the final battle to decide the fate of the world. And with the help of the Four Heavenly Knights and Micaela, Luka and Alice defeat the tyrannical Goddess, finishing her with Quadruple Giga, infused with holy and dark energy from Luka and Alice.

And with Ilias's death, Heaven disappears.

Monster Girl Quest Paradox
After the events of the Original Monster Girl Quest Trilogy and the downfall of the Goddess of Creation Ilias, Heaven has disappeared and created a chain of events. In paradox world the Heaven fell down from the sky after the Great Disaster occurred and now is in the Snow Continent where angels now are residing. Snow Heaven is being currently ruled by Archangel Ranael while the head proxy is away. Due to the known existing of other parallel worlds. Heaven from Ilias' world can be seen in a vision when Luka and his party arrived at Esta, however this world is  being controlled by Goddess Ilias and all residents have been stripped of their free will in exchange they can live safely under her watchful eyes. Later the truth about the Snow Heaven's creation was explained by the Goddess Ilias from the Paradox World. On Ilias route the shocking moment is revealed, the tiny Ilias is actually from the original world's timeline when Ilias was stricken down by Luka and Alice. Without the Goddess of Creation, Heaven has been deformed just recently when Black Alice from the original timeline was defeated by Luka and was sent to another world and another time. The research led by Promestein started the invocation of Black Alice from the original world and has absorbed Chaos energy and became the Chaos Goddess. This results in Heaven and Ilias manifesting into different worlds. and Ilias finally understood why she can't recall the events from the Paradox world.