Duel Banners
The idea behind this concept is a way for people to duel someone from another faction without your face getting ripped off for interfering. Basically all they do is draw a ring of about 30-35 meters around the players with a banner in the middle, so people can see that a duel is taking place.
Should any opponent cross the border, the duel is over and the victory goes to the other player.
I'm thinking there could be a way to keep tally of duels to maybe introduce additional benefits like titles (Dueller, for example), dyes, armours and other goodies to promote duelling.
How does it work?
Target the player you wish to duel and use the banner. A request is sent to the challenger and they may accept or decline. The banner is consumed on acceptance. Each player has 6 seconds to prepare before the banner plays an animation and duel commences.
Obviously this would work much better if we had a LFD (Looking for Duel) tool, or if you have friends from other factions in your friends list. It just means you can duel without people interfering accidentally.
Banners cannot be placed in or around keeps and resources.
Obtaining a Duel Banner
You can purchase a duel banner from any of your Siege Merchants for 500 AP.
But I don't want to be bombarded with duel banner requests
Fair enough. By default, a gameplay option "Accept duel banner requests" will be turned OFF. Attempting to use a banner on someone with this option disabled will result in a message similar to "This player is not accepting duels" and they will not be harassed in any form.
So basically what I'm saying is, if you have no interest in duels, this will not affect you in the slightest.
But wait, there's more
Duel banners can also be used on same faction players any where in the world. Once a player from your faction accepts the duel, you are both marked as enemies to one another while inside the ring. This, however, has no benefits towards your duelling status outlined above regarding titles, dyes and armours. It's purely for fun.
Alternative
PvP arena.