Agartha Singularity. Part of me thinks Agartha got unfairly treated in JP because it had lots to live up to after SE. PH, which was a fairly great sub-singularity that raised the bar a bit high.
Ultimately it comes together into an exciting ending and was a fun thing to play through in terms of fights, I think it stands up just fine with Shinjuku. The Mythical Subterranean Society: Agartha (伝承地底世界 アガルタ, Denshō Chitei Sekai, localized as "Subterranean World of Folkore: Agartha"), The Woman of Agartha (アガルタの女, Agaruta no Onna), is Subspecies Singularity II (亜種特異点 II, Ashu Tokuiten II, localized as "Subspecies Singularity II") of the Remnant Order dealing with the aftermath of the Human Order. With the stage set on the enormous underground hollowed space of 「Agartha」, The mission to destroy this Pseudo-Singularity will soon commence!
Pseudo-Singularity I Opening Agartha: The Mythical Subterranean Society (伝承地底世界, Denshō Chitei Sekai, localized as "Subterranean World of Folklore"), alternatively The Woman of Agartha (アガルタの女, Agaruta no Onna?, localized as "The Women of Agartha") or Subspecies Singularity II (亜種特異点 II, Ashu Tokuiten II?
It is responsible for the Agartha singularity, having cooperated with Scheherazade and amplifying her Reality Marble to allow it to bring fiction into reality on a much greater scale.
PH, which was a fairly great sub-singularity that raised the bar a bit high. Pseudo-Singularity II : Subterranean World of Folklore, Agartha: The Woman of Agartha Set in A. AniplexUS has dropped the trailer for the upcoming Fate/Grand Order story segment, Pseudo-Singularity II 'Agartha'.