I was thinking about rules for upgrading a Space Marine in a Assault or Tactical Squads to Chaplaincy Initiates or Lexicanium (the latter being based on the assumption that the HQ Librarian choise represents a Codicier, or an Epistolary if upgraded). What rules should such upgrade characters have? I was thinking that the profile of a Veteran would be appropriate. Existing fluff says that Lexicanium don't wear psychic hoods, so they would get one power and maybe a force weapon. For a trainee Chaplain I have no idea. Perhaps a reroll of a Sweaping advance roll?