Beast II

Beast II (ビーストⅡ) is a Beast-class Servant who appears in the Grand Orders of Fate/Grand Order.

Identity
Beast II's True Name is Tiamato, one of the few Primordial Deities in. Tiamat is an Earth Mother Goddess, a branch of 's forgotten goddess.

The gods were born from the union of the freshwater and the saltwater Tiamat. Then, the gods rebelled against their father, and seized authority over the world from him. Tiamat quietly approved of her children’s actions. It was proof that her love for her children outweighed her love for her husband. However, the gods then turned their blades on Tiamat. Tiamat wailed and raged, birthing eleven new Magical Beasts to oppose the gods.

At the end of the war, Tiamat and the Eleven Beasts were destroyed. The gods split Tiamat’s corpse in two, and used them to form the heavens and earth. It is said that this ritual created the world of humans.

Tiamat is the womb that was cast aside after the world was created. She is the Maternal Sea who was used as the soil to give birth to life, but once the Earth’s environment settled and ecosystems were established, Tiamat was deemed unnecessary and driven out into a World of Imaginary Numbers (虚数世界) -- described as the World of the Reverse (裏側の世界); it is unclear as to whether this term refers to the Reverse of the World (世界の裏側). This realm does not qualify as a parallel world; it is, however, a space that contains no life.

Because the Earth’s ecosystems were established, Tiamat, who randomly designs life, was no longer needed. The goddess became nothing more than an obstacle to the process by which life forms acquired the intelligence determined by the planet. Since then, Tiamat has been waiting in the world of imaginary numbers for her chance to return to Earth.

Appearance
The black mud is also included in Tiamat’s height. However, the mud is made of imaginary numbers, so her weight is unquantifiable. Meanwhile, Tiamat’s volume is infinite. In other words, she is a four-dimensional pocket.

Personality
It is impossible to confirm if Tiamat possesses anything resembling a personality. Perhaps she lost her intellect, or perhaps she never had one to begin with. Either is acceptable. The only meaning to her existence is to create, raise, and love her children. Thus, she set out to make war against humanity for declaring that it has no need for her. It is the functioning of an extremely primitive system: “If I do not exterminate modern humanity, I will be killed.” While she does hold a grudge and bears hatred and sadness for being abandoned after her purpose has been fulfilled, she is doing this to indulge in the "joy" of once again becoming the mother of everything.

Motivations, behavior towards master. One of seven billion. An obvious target to be obliterated. While the Second Beast is a repulsive invader to humanity, humans are terrifying aliens (extraterrestrials) to the Second Beast.

Babylonia: The Absolute Frontline in the War Against the Demonic Beasts
While Tiamat was returned to this world by the collapse of the Human Order Foundation and the power of theHoly Grail, she remained in a deep slumber. Setting aside the fact that Merlin's magic kept her asleep, once Tiamat was attacked by Chaldea, she woke from her sleep and set out to follow her instincts and purge humanity.

This did stem from Tiamat’s resentment, hatred, and sorrow for being abandoned as a used tool, but she was also joyously indulging in the repainting of Earth’s entire ecosystem and returning all of it Bold textto its mother.

It is due to this true nature that her class was chosen. “Goddess of Creation” and such are but false titles. She was deserted by humans, becoming the catastrophe most strongly rejected by human history.

Other appearances
In Fate/Extra CCC, Tiamat was mentioned in BB's Potnia Theron skill. It is the authority of the Earth Mother Goddess whom BB compiled and absorbed from the abyss of the Moon Cell. It is the embodiment of the power of creation possessed by the mother goddesses and even branching to Tiamat.

Abilities
Authority of the Beast (獣の権能) is an anti-humanity Skill. It is an ability that is especially effective against Heroic Spirits, Divine Spirits, and all things born from the mother’s body. This Skill is not possessed solely by the Second Beast, but also by all Magical Beasts she gives birth to.

Independent Manifestation (単独顕現) is a skill to manifest independently in the current world. Seven days after manifestation, the Indian Ocean will be smothered black. Once Tiamat manifests, she unceasingly gives birth to Magical Beasts, and sets out to devour humanity. However, the body of the Second Beast is the ocean itself, so it cannot move onto land. Instead, it is her children’s role to mop up the human race. Furthermore, this Skill is an expression of the holder’s presence across all of space-time, rendering her immune to attacks by methods such as time travel paradoxes, and canceling out all instant death attacks as well.

Self-Modification is a skill that can remold her own Saint Graph using the black Sea of Life. Her body can grow from its standard Saint Graph (Femme Fatale) into that of a Dragon over 60 meters in length. Once Tiamat becomes a dragon, attacks against her of A++ rank or lower are nullified.

Sea of Life (生命の海) is a skill that the Second Beast itself is the sea which gives rise to life. It cycles the True Ether of primordial Earth, so its Magical Energy supply within this sea is infinite. All who are caught and drowned in the black mud are randomly assigned the following Skills: Self-Modification, Life Transformation, Life Fusion, and Individual Multiplication. Once these organisms exit the sea to make landfall, they are forced into a cellular-level Geis — a nitrogenous contract (amino-geis) — and automatically become enemies of humankind.

Nega Genesis (ネガ・ジェネシス) is the same type of skill as the same type as Negamessiah, which is possessed by the Sixth Beast. It is a conceptual bounded field which completely overturns modern evolutionary theory and the predictions of Earth’s genesis. Thanks to this ability, the Second Beast has acquired a strong resistance to the Noble Phantasms of Servants created by correct human history.

Monstrous Strength is a skill that raises the user’s Strength. One’s ability as a monster. It is at about the highest possible level. This is why Tiamat’s Strength is that of a titan when she makes the black mud into her body and manifests in her draconic form.

Development
Kotetsu Yamanaka is the character designer for Tiamat.