Long ago, the gods fought the elemental primordials for dominion over the material realm, banishing them into the elemental chaos. Those primordials have not forgotten this attack. The echoes of this great war may occasionally manifest into a powerful warrior capable of controlling the elements to deal swift justice to those who would oppose them. These are the Barbarians on the Path of the Elemental Spark.
In this subclass, you will learn to control the elements and focus them into short bursts of AoE damage while you rage. You will gain mastry over different elements as you gain levels, until you eventually learn to throw huge amounts of elemental energies, combining more than one element in a devastating effect.
- from the publisher's blurb