There is no Parry skill in Dark Heresy.
Duh, you're right. Must've had a senior moment there. Though I distinctly recall being miffed about some close combat ability that was present in IH, but missing from BoM…
Luthor Harkon said:
Well, they (i.e. the Sisters of Battle of the Ebon Chalice) are mentioned as being the most elite and dedicated troops in the Calixis Sector. And they number around fifty… Not sure what you mean by more numerous and less elite honestly.
It's over a thousand now. BoM upped the numbers considerably by stationing troops from nearly every Major Order in the sector. The largest would be the Order of the Bloody Rose with a full Preceptory.
I liked the old numbers in the Inquisitor's Handbook more, too. I imagine that the size was upped so that (a) players would have more freedom to choose what Order their character might come from as well as (b) allowing GMs to have them appear as NPCs or enemies more often, without actually running the risk of their entire presence being terminated.
With the Storm Wardens in the Deathwatch book, the Calixis Sector now has its own Space Marine Chapter as well, so I imagine the "most elite" perk is gone, too.
Perhaps it's worth pointing out that the original rulebook as well as the Inquisitor's Handbook were produced by a different company, so perhaps FFG is just having a different vision.
Luthor Harkon said:
Besides, purging Marine Chapters happens maybe about once every couple of centuries, so not really a "normal field of duty" for anyone if you ask me (even though it might have been mentioned many years ago in some of the more obscure background in the decades GW existed (but there are a lot of weird things in the GW background of the past anyway).
Last mentioned in the October 2011 issue of White Dwarf, actually. Before that, the most recent source was (to my knowledge) the Index Astartes IV from 2004, or more specifically the Rogue Space Marines article in it.
You're absolutely correct in pointing out that it won't happen often, but it doesn't seem likely that FFG's Sisters would be capable of performing this task at all when called upon. I suppose it's possible that this might be more due to the newly introduced equipment gap and how damage mitigation works in the rules, but it's obvious that the writers realised it when you compare the descriptions in the BoM with the Sisters' Codex fluff.
Just like with many novels, some things are just a little different in this interpretation of the setting.