Just stumbled upon my first incredibly strong combination in spvp.
Me and a buddy were both warriors. We stuck together whenever we were on the same team. When one of us went down the other would drop the elite banner. The elite banner when summoned rallies all downed allies, as well as providing a big buff. That gets him back up and we keep fighting, now they have a disadvantage from the banner, as well as having less hp than when they started the fight, they down me? Buddy drops his banner rallying me.
Now we have 2 elite banners stacking on eachother, giving huge buffs, and an extremely weakened enemy fighting two warriors that 'Just won't fucking die.'
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Also on a more solo method, in the ruins on the capricorn map. Warriors have a downed skill that lets them get up and fight normally for about 10 seconds, downside is that they have almost no chance of rallying on kill when they do that, and if they run out of time or get downed in that state they go straight to defeated, it also starts on cooldown, not being useable for about 5 seconds after they go down.
There is a trait that gives warriors the normal 100% chance to rally when they kill something in this state. If the sharks are aggro to the warrior while fighting in the ruins, a vengeance warrior in this state only needs to kill a shark, a simple task if a team fight is going on down there thanks to all the AoE being thrown around, made even simpler thanks to a spear warrior having a really strong AoE attack, and boom, free rally. One really long fight down there had me vengeance and rally 6 times doing that.
I would be downed, I would start punching and kicking the nearest target, and then pop vengeance when it became availible, use the spear spin into the mass of fighting players and sharks and rally every time. I was finally beaten when the rest of my team died and the other team focused me down before vengeance came off cooldown.