I am trying to find an amulet with the Assassin’s prefix (+2 Rogue Mastery Skills). I’ve never specifically farmed vendors for any items similar to this before. Do I need to be a minimum level for this item to have a chance to spawn, or is it based purely on the level of the vendor?

At least while the forum is still in it’s infancy, it may help drive activity by reducing the amount of boards. I would suggest deleting all boards that have no threads or only a few threads. Only add new boards as the need arises, not before. Perhaps the exceptions could be for the various Masteries, however depending on the forum software (I’m not too familiar with SMF) you may be able to implement a post “tagging” feature where keywords are added as “tags” by the thread author. For example, an Avenger guide will be tagged with “avenger”, “hunting” and “earth”. This could be a workaround for having duplicate forums for individual Masteries and all the possible Mastery combinations.
 
I really want to see this community flourish but I think growth will be hindered with the board in it’s current form.