"Faster than humans can fill the land... Faster than the humans can destroy the planet... I shall give birth to demons to keep them in check! So long as this land is abundant with seeds, I will birth an endless orchard of demons!"
—Tiamat, Shin Megami Tensei: Strange Journey
Tiamat (ティアマト, Tiamato)? is a demon in the series.
Tiamat is the Babylonian deity personifying the seas. It is also considered the mother goddess of primordial chaos, giving birth to a number of deities that later turned against her. She is portrayed as either a sea serpent or a dragon.
"The primordial goddess of Babylonian lore. She governs the sea and gave birth to many deities with her consort Apsu, the god of fresh water. When war broke out between her and those gods, she created 11 monsters to fight with her, but they were defeated by Marduk. Her body was ripped apart and used to make the world."
Tiamat's moveset is focused on Ice, with her signature Mother Earth skill doing ice damage to the entire team and healing her based on how hard it hit. Bring demons with ice immunity or resistance to blunt her offenses. Also be aware of her Sunset Melody that inflicts Almighty damage and lowers attack, and Luster Candy that buffs all her stats.
Tiamat's AI is rather responsive regarding her unique skills. She uses Pure Blue, which purges debuffs and restores about 1000 HP to her, if she gets fully debuffed - to avoid seeing this, keep her at -3 debuffs at best. She also uses Diarahan if you throw up any attack reflecting item or skill.
The leader of Team Red in the Challenge Quest, RxW Smacktacular XIII. A god among gods, she tells Flynn she doesn't understand why the humans would participate in these games, as she was summoned and ordered by the Ashura-kai to participate rather than choosing to. Since she can't disobey, she wishes to just get it over with. After her defeat she is impressed by Flynn and admits that she never thought she would get beaten. Asking if he is Flynn and having it confirmed leads her to tell him the Ashura-kai were wary of having him participate in the games, and that things have gotten interesting before crumbling. She later becomes a common encounter in Infernal Tokyo.
"The primordial goddess of Babylonian lore. She governs the sea and gave birth to many deities with her consort Apsu, the god of fresh water. When war broke out between her and those gods, she created 11 monsters to fight with her, but they were defeated by Marduk. Her body was ripped apart and used to make the world."
—Shin Megami Tensei IV Apocalypse compendium
Tiamat can be found in Tsukiji Konganji or she can evolve from Mushussu once it reaches level 52. She can teach Nanashi the Ice Breath, Megidola and Silent Prayer skills through her Demon Whisper. Tiamat benefits from learning Ice and Almighty skills. At level 60, Tiamat will evolve into Ym, provided that Nanashi can control the result.
"...WHY DOST THOU AWAKEN ME? I HAVE LONG FORGOTTEN BATTLE... FOOLISH ONE... THE POWER OF MAN IS NOT ENOUGH TO DEFEAT ME..."
—Tiamat, Devil Summoner: Soul Hackers
Tiamat is one of the two ancient demons inhabiting the ruins beneath Nikamimon, the other being Apsu. Their presence interfered with the Phantom Society's plans of installing Manitou at the site, so Vice-Minister Nishi hired Naomi to eliminate one of the demons to make room.
During the associated Vision Quest, the player must choose whether Naomi eliminates Tiamat or Apsu. If Tiamat is confronted, upon its defeat she curses Naomi and kills her as it dies. The goddess's power is later absorbed by Manitou, which gives it strong magical attacks but a vulnerability to physical attacks.
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