City Arenas
 

Does anyone know what makes your client know the area in a city that is designated as an "Arena"? Like when you step into it, you get notified in your chat window: "You have entered an Arena (PVP) area."

I can't seem to find that text in the Emu source, nor the .pl files for Quests (thinking it was a hidden proximity NPC or something?) Is this some special areas in the zone files themselves (client-side)?

I don't think the city arenas work anyway, but the message is intriguing. How does it know?!

TIA
J