All of the prestige classes need the terminology updated to match the new rules.
Carrion CarverWhat if you already have the ability to cast ossiens?
Carrion House needs some text saying what happens if you leave and re-enter the 10 foot area.
That is a huge breath weapon....
Speaking of huge areas of effect.
Makes me want to make a villain that's immune to Con damage.
Crippled MysticMind over Matter - You should put the Dex loss at the front of the class ability, otherwise it sounds related to the saving throw alteration.
Mental Reserve - Same as above. Does delaying the effect still use up its duration?
I'm not sure how I feel about this class as a whole.
Master of the BonesIt's like you want to keep making prestige classes based around being an end boss.
Priest of the PeopleWhat's the action type for Furious Command?
I'm not sure how I feel about the ceremonies. I can't even imagine the bookkeeping for Devil's Dance and Angel's Mercy. Shadow's Flight sounds like it is supposed to be defensive but it's an amazing buff! Does Safety have a way to get back to the material plane?
I'm not sold on this class from a balance perspective.
Psychic ChirurgeonI think this is the first psionics support that I've seen for Arhosa.
Other than that it looks pretty standard for a dual casting class.