Classic Horrors revisited has your Weeping Angels.
As to the patrified celestials...
Matt's Magic stuff
Spoiler:
Rules are made to be broken. Maybe a rite was performed that stripped their angelness? Maybe it was an epic rite that petrified them? Maybe they aren't petrified, but are slowed down so much that it appears that way? Maybe they are just coated in a thin, nigh indestuctable Abaddon stone that blocks their SLAs so they are aware, immobile and trapped? Magic, IMC can do pretty much anything, given time and research. You want to petrify angels? Research a 9th level spell to do it and describe to me how it works. You want to kill Am Barbarian? Work up a spell that requires laws of sympathy and cotagion, and his true name and it will be a finger of death with a massive penalty to save, that only works on him. Heck, to me high level characters (even fighters and rogues) are breaking reality to some degree. A 20th level knife master can take a butter knife and do 160+ damage to a target. A 20th level fighter can wear his adamantine full plate like I wear a shirt, and smite dragons. What they do is magic as well, defining it as 'abilities beyond mortal men.'
Never noticed this before, and only noticed it now because I was double checking to make sure a plot point could work.
Wonder if there's something to read into that. Like a possible cosmological war endgame scenario, or if it has roots in the past.
Hmmm... The now dead CG creator god Ihys was the patron of free will...
Unlike mortals whose souls are separate from their bodies, the soul of an outsider is part and parcel with their physical bodies. That might have something to do with it.