It doesn't have officil behest on your screen like behest in camp, so..
It happen to me near Camp Tranquil. Suddenly bunch of Garlean show up
Talk to nearby NPC to start (no quest title).
Beat them, you got a chest with Deaspected Crystal
Seems lot of player can join
And Garlean level were 20 (war hound), 25 (various garlean), 30 (garlean centurion)
Edited, Jul 23rd 2011 1:20am by rinstar