Changes for PVP on PVP servers

Summary
Basically, make the town a safe zone and outside areas a PVP zone.

Core concept
When in the main town you can not PVP unless you request a duel and if accepted only those two players can damage each other and nobody else. Then when outside of town you can then enter combat with anyone at any time. To prevent camping you have a 1-minute shield that prevents you from taking damage and from damaging anyone else in the wild zones. (Mine, forest, a maze for warrior shrine, and bandit camp)

Personal twist (optional)
A leader board for players that have won most duels in town.