Guild Wars 2

What the title says but only for Living story event like Clockwork Chaos. where we have lots of players playing together.

Guild Finisher, available only when a champion is killed, the person from a Guild to do it will lay down a banner that if other players approach, interaction will pop up, giving one of the following in battle,

sample of what the banner buffs
+ damage
or
+healing power
or
revive every down player in the vincinity of the banner.
or
+armor

how many banner(s) and duration of the banner being active will be decided by ArenaNet.

Edit:
BTW: please add a speed boost thing in this finisher, as it would help players in running from A – B in events.

So you are suggesting that when a champion is killed, guild members turn into banner warriors…. because everything you just posted, banner warriors do.