Translated via google (aka blunt force trauma style) of Tiamat lily's info:
The beast of the creation that emerged as a young child, unable to put up with the situation in which the human race in 2017 who defeated himself was about to be destroyed by the same "disaster coming from the sea".
Tiamat created a "reset and reborn" division, and sent it to the "Apocalypse Record Zone", a compilation event that was forged and seduced by "disaster."
Therefore, I have a clear memory of losing to humankind once. I always feel sullen because I remember the humiliation and pain, but rather than that, the spirit servant who has too much love to "protect humanity".
Will probably have Goddess Essence EX, Independent manifestation C-E, and Nega genesis (advantage in damage delt/recieved from Man and Star attribute foes) as passives. [could potentially include territory creation and magic resistance of B+ or higher as well]
Actives would likely include her Monstrous strength, some manner of Star eyes, minor output of the Sea of Life, and her singing
Edit 2: wow i got close!
Im gonna have a f**king stroke if arcade gets loke lev lainur or goetia as a godamn servant
Pretty sure we're getting Goetia in standard FGO as Pretender in either Lostbelt 7 or 7.5
Edit: Goetia's narratively relevant to normal FGO and not at all to Arcade - and to be fair, i'm amazed anyone got to summon Tiamat at all, given how long ago she appeared now.
It's real. I'm very jealous of arcade right now.
I know! hoping they release a steam version or something for PC eventually - as long as they give you the option to summon without microtransactions, I'd pay $30 for it.