The area where Mehniel crashed is consecrated ground. Demon-fueled powers and technology won't function for long within close enough range.
The demons are studying the crash site and it's under heavy security as a result.
Speaking his true name into holy water was successful at opening up a channel to him. Unclear if using the name "Mehniel" would be successful.
Mehniel is currently being held in a crypt inside the House of Mirth. The walls depict the story of a fallen king in Egyptian.
He was captured using a large carriage that sounded like a “horrifying beast”
His description of the party that captured him was a demon with many eyes, that smelled of lilies; one with lion’s feet, that smelled of roses; one with burned legs, that smelled of myrrh; one that crackled like lightning, and smelled of rain - all evidently impersonating angels, save for one.
Mehniel believes they’re keeping him as a way of accessing Heaven and taking it for themselves.
Angels can be healed using light or holy water.
Pythia
Pythia has a residence in Tokyo-D, but she does not live in Tokyo-D fulltime.
The locals and her employees refer to her as "The Oracle."
Mehniel could not tell if Pythia was an angel or a demon.
The locals say Pythia herself went to retrieve Mehniel.
She still takes the form of a woman with burned legs and bare feet.
Furfur
Has an ability that allows him to alter memories and wields the power of lightning.
Of the party that captured him, Mehniel confirmed that Furfur was once his comrade - a fallen angel.
Claims he defected from Heaven to follow his wife, who died - presumably before the fall of Heaven.
Is working as Pythia’s head of security, though he claims the job is usually dull.
notes following angelquest
Pythia
Furfur