REALLY random idea: A deep dungeon, but all Jobs have their PvP kits.

[Shurrikhan]

WAR LB nullifies guard and prevents status inflictions, so designing enemies that could guard and apply status effects would probably go a long way into making this mode more dynamic and fun too.

This. If you give a PvP kit without the PvP mechanics (being usable by the mobs), too... that's most of the value left on the floor.