Tiamat, designated Beast II, emerges from Mesopotamian mythology as the primordial goddess of the saltwater sea and Earth Mother. Alongside Abzu, the freshwater god, she birthed the first generation of deities. Betrayed and slain by her offspring, her corpse forged the heavens and earth—a narrative reimagined in her backstory as a discarded creator deemed obsolete once Earth’s ecosystems stabilized. Exiled to imaginary number space, she plotted her return, fueled by volatile resentment toward her abandonment and enduring maternal devotion. Her resurgence in the Babylonia Singularity ignites when the collapse of the Human Order and a Holy Grail’s influence disrupt her imprisonment. Temporarily suppressed by Merlin’s magecraft, she manipulates events through proxies like Gorgon before awakening fully. Her mission—humanity’s extermination—stems from a grim survival imperative: eliminate humans or face annihilation herself. This duality mirrors her conflicted essence as a mother who cherishes yet resents her children’s independence. In her final moments, she pleads against abandonment yet concedes separation’s necessity for their growth. Tiamat’s power revolves around the Chaos Tide, a corrosive essence that mutates life into demonic thralls. The Primordial Sea endlessly spawns Lahmu, entities rivaling Demon Gods in strength. Her immortality manifests twofold: she lacks any concept of death, requiring external forces to impose mortality, and cannot perish while terrestrial life persists. Defeating her demands severing her planetary ties and wielding conceptual weaponry to nullify her regenerative nature. Expanded lore reimagines her beyond mere villainy. In *Fate/Grand Order Arcade*, she manifests as Larva Tiamat—an Alter Ego born from resetting her existence. This iteration allies with Chaldea to shield humanity from emerging threats, embodying a hypothetical path toward redemption. Though her larval state suggests restraint, she retains the capacity to unleash her draconic true form via Noble Phantasm, hinting at lingering tensions between destructive impulses and latent benevolence. Thematically, she embodies regression’s dangers, symbolizing humanity’s struggle to outgrow primal reliance on maternal safeguards. Her role as the “original woman” underscores the peril of stagnation under overprotective nurture. Visual motifs reinforce this: her lair mirrors a monstrous womb, while her form leaks Chaos Tide—a corruptive force that infantilizes victims. Across adaptations, Tiamat intertwines mythological roots with layered tragedy, her love and wrath inextricably fused. Her influence ripples beyond Babylonia, shaping collaborative narratives and alternate timelines where her actions persistently test humanity’s resolve to evolve beyond her shadow.