Arelith

I believe this has been suggested before, but I really think now with the new Cordor update, this could add more tools for thieves to communicate behind the scenes. Similar to the graffiti placements seen around some of Arelith's notable fixtures, the Thieves' Mark would leave a small, difficult to notice placable against a fixed wall that would only last until the next server reset.

What the mark displays should be restricted to specific commands based similarly on Elder Scroll's shadowmarks:

• Safe
  Drop
  Danger
  Protected
  Loot
  Empty

The thief could purchase a specialized dagger from an NPC only accessible through appropriate channels, so that a wide variety of classes who ascribe to a certain skill set will have access to the marker. The dagger would only be able to place one mark per reset, if possible erasing a previous mark in favor of a new one.

This new tool would be useful to facilitate dead drops, organize meets, and point out potential secrets otherwise unknown to a skilled thief.