One of my groups recently crossed the Rank 4 threshold with some XPs to spare, and most of them are thinking about picking up an advanced speciality. I have a (Templar) Chaplain, a (Salamander) Forge Master and a (BA) Epistolary already in the pipeline, and the two undecided players are contemplating picking Keeper and First Company Veteran, respectively. The way I see it, this is too good an opportunity to ignore in order to enhance the role-playing aspect of my campaign, so I decided to go down the following route:
I will let them spend the XP and gain access to certain advancements and special abilities (decided by me on a case-by-case basis), but I'll withhold most of the goodies for now. To get access to all the aspects of the Speciality, I plan to create trials (presented by the senior officers of the speciality in question), and only after all of those are cleared will the player be truly elevated from an aspirant to full Chaplain/Epistolary/whatever status. The nature of the trials revolve around three main elements. One is the prerequisites list of the Speciality: a Chaplain needs WP 45+ and Fel 40+, so he'll get a trial based on Willpower and one themed around Fellowship. The second is the personality and Chapter of the introduced NPC senior officers: to stay with the example of the Chaplain, one introduced ranking officer is a Fist, so pain gloves will feature in the players WP trial. The third is pretty much a wildcard: an amalgam of the Chapter beliefs and available background fluff for the chosen speciality - for the Chaplain it involved writing up unique Litanies of Hate (fortunately the player is fully on board and very much involved).
The advantages I hope I'll get from this are more quality RP, as the players are forced to get to know and use the practices and tenets of the cult or secret society they choose, the feeling of achievement on the players' side, and to a lesser degree a multitude of plot hooks I can introduce rather easily this way.
Now, after the rather long-winded explanation, my question: Did any of you use something similar? If yes, what elements, to what effect? What do you think could be a good trial for a Techmarine or a Librarian (both on the field or back in the Watch Fortress)? Do you possibly recall any background material detailing such an elevation in a Loyalist Space Marine environment? As you can see, the Chaplain route is already partially fleshed out, as I slowly compiled a rather large GW and BL reference collection - an appreciative audience does wonders, after all. I'd appreciate a few pointers or ideas regarding the other trials though, to make the process feel more vivid.