Daishain’s 5e D&D Rules, Q&A, And Support The Sage says...
I thought that was the issue, things can get confusing between multiple threads. I do apologize for that. Do try to check here when there's new stuff before posting in the main. Outchar discussion of what's going on often occurs here rather than there, mostly so we can keep the main thread uncluttered.
EDIT: New reference! Time for a bit more background! The Zhentarim, also known collectively as the Black Network, are in some respects the Harpers' main rival. Similar approach in that they both use information to achieve their goals, but these guys use it for their own greedy gain, leveraging as much economic and political power they can from the situation at hand.
EDIT2: To clarify, what Cratol saw wasn't a mark, but a living, if small, snake that had been hidden up his sleeve. He just saw the head though.
Edited: daishain on 6th Jan, 2017 - 4:24pm