Inspired by that other thread on the Sisters (here), and my musings on the subject, I was wondering if the Deathwatch marine rules could be used to model the Sisters in the Rogue Trader era sense?
Back then the Sisters were basically female space marines, and they were more than a match for the marines in a fight (the Sisters 'policed' the marines).
Marines would be moved more towards my ideas on them (here), and the sisters get one hell of an upgrade. In order to keep them up with the Marines they would have to become 'Amazons' - genetically modified to improve their performance (or taken from 'Amazon' stock). The may lack implants, but they gain natural abilities plus chemical enhancers. You could tack on 'faith based powers' to give them an edge like the marines.
As to why one of these RT era Sisters would be following around the Deathwatch?
Policing.
It's what the Sisters do: get in other people's business.
The Sister (or Sisters) may be helping the killteam at times, but they may also be watching the marines for deviancy. This could introduce a new dynamic to the role play, as the Sisters my say when they think the marines are going too far.
Marines may be the ultimate xenos hunter of the Imperium, but the Sisters are the ultimate law enforcers. The fact the Sisters like the Imperial Church, and the marines often see the Emperor as a man not a god, is only going to stir up trouble.
?
Philip



