Bilateralrope said:
Do you really need to describe exactly what he looks like ?
If I was in your position I'd just describe him as an Ultramarine librarian. Maybe mention that he follows the codex* closer than anyone else they have seen in Deathwatch. If that isn't enough, ask them what they think he should look like after he shows up.
*It must be noted that the entire structure of Deathwatch has major differences to the codex. To the point that I'd say that the Deathwatch is the chapter with the most variations from the codex astartes.
Yes. I do "need" to describe him in great detail. It's all part of the larger plot. This character will make frequent apperances in the campain and (without giving out to much information in case my players will read this) when I describe the details of his gear I'll make some subtle changes that the players might notice. Those changes will ofcourse have a meaning.
I, and one of the other players (that are our groups other GM), like to use these kind of "Sherlock Holmes" type of clues in the missions. Sometimes they get noticed and sometimes they don't. The dice are usually reserved for do-or-die moments in our games.