Quest: The die is cast
From Shin Megami Tensei IMAGINE Wiki
Condition: clear Rainy Days Never Stay
Location: Talk to Yagia at Nakano Campsite to teleport to Shinagawa Catacomb of the Templar Knights (Alternate).
Experience: None
Guide:
Talk to Gryphon NPC in Shinagawa Catacomb of the Templar Knights (Alternate).
South Route leads to Diana for a fight, then again for another fight.
North Route leads to Abraxas for a fight, then again for another fight.
Talk to Gryphon and go to Black Maria for a fight.
Defeat Flamies ⇒ Aquans ⇒ Aeros ⇒ Earthies in this order or Black Maria will be invicible. Defeat her to finish quest.
You can teleport to this are and repeat the fights anytime.
If you defeat Black Maria before any Wil o'Wisp suicide or be killed, you get Black Maria plugin.