Originally Posted by
facelesssoul
In Twilight Highlands there is a place called Firebeard's Patrol, If you haven't done the Dunwald quest chain there should be a steady stream of fire mobs that are attacking the camp. Now the idea is that if you tag them when they are close to full health and let the guards take them down you get almost full XP and you get to loot them as well for vendor greys and Volatile Fire. Tested on EU server.
Also this might work for similar areas where you just get full credit for the kills done by guards etc.