Marauders have an ability called 'Demolition' that hits everyone infront of them for some damage,
but if you use the tactic 'Widespread Demolition' there is a bug that makes your demolition attack hit TWICE, so it does double damage
So just get this tactic, go into scenario/RVR/public quest .etc, and just spam it
If you have 2 marauders spamming this, you can kill an entire warband of Order players in under 10 seconds (if they are grouped close together)
enjoy