Burning Vengeance

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Berserkers are the enemies with two Axes. To make them burn you have to push them into a campfire. Then you have a couple of seconds to land an execution finisher (Y + B on Xbox).
Any stronghold works great for this. There is one on the far right side of Udn. Look for a campfire and let an enemy set off the alarm. Now lots of Uruks will come running to your location. Although the enemies are absolutely random, there is almost always a Berserker in the group. Build up a combo streak, then throw him into the fire. You can throw enemies by pressing RB (Xbox). Perform the finisher as soon as the Berserker starts burning.

The campfire can only be used once. So if you don't land a finisher quick enough, or if no Berserker spawns, then fast travel back to the nearest Forge Tower to try it again.

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