[Tyhm]

The history of J:

It was invented
Debated
Rejected - too easy to abuse
Forgotten
Reintroduced
Debated
Rejected - too much work
Forgotten
Reintroduced
Not quite yet Debated

It's probably pretty easy to add the actual J right. But let's take a look at the rest.

Obviously, we can't let anyone with the J right warp anyone from anywhere to anywhere.
Nor from anywhere to jail.
Warping's kinda silly.
How do they get to jail?
The Jailer drags them?
Calls the Guards?
From anywhere on the island? That's a lot of scripting.
What if the jailed logs off before they get to jail?

The jail itself will be easy to construct, but how does one get out? Time? Attacking the wall? Released by anyone on the outside? Released only by a king or jailer?

Who can jail who? Only Jailers can jail anyone? Even the King? Anyone with J right can jail anyone without? Seems safe, but anyone at all on the kingdom island? Only Kingdom members? Only their own kingdom members?

Under what circumstances? After lowering them to 10% health? What if they're in peaceful? Does this only apply to "invaders", or can jailers jail their own kingdom's members without weakening them first?

My take on it is the Jail has a door that can only be opened on the outside but by anyone. NPC Guards keep those without the J right away from the door - beat or evade them to free your friends, they're basically humanoid wolves without a jump attack, or humanoid bomies more likely. The Jailers can smith Manacles out of Iron Bars, and use them as a weapon on anyone while on their own kingdom island and on tag. Anyone with Manacles on must follow the Manacles owner. Anyone who logs off with Manacles on warps automatically to the Manacles' last position, or in the Jail if they're emptied. The Jailer can pick up Manacles when the victim's been dropped off in the jail.

Difficult to script the Manacles. Very, if you want the jailed to continue to be visible after they log off. About as hard as pets. A scripting project of this magnitude will require taking some good scripters off bigger projects - horses, cooking, etcetera...or I could throw together something lame with server strings...