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Let's assume that instanced PVP battlegrounds and arenas are off the table. Also assume that PVP must be avoidable for PVE'ers.
That leaves a few options.
Note: "working best" means working best so that PVEers, PVPers and those who like both are satisfied with the design.
Ken Fisher - Semi retired old fart Network Administrator, now working in Network Security. I don't Forum PVP. If you feel I've attacked you, it was probably by accident. When I don't understand, I ask. Such is not intended as criticism.