Calradia Slave Rebellion.

[Kwal]

The duel servers, which are down now (except for the snowball server I think). I won't show you, you can just look in the server browser yourself if it's still online.

I'm not saying it's comparable to an official PvP gamemode, just pointing out that

You also share account and character with the Invasion gamemode, so you can play PvP or Invasion by your choice by server, without need to going to another Module

was also done in NI

But yeah, an official PvP gamemode should be really cool and I'm anxious to try it out. Congratulations on your achievement