Increases your critical strike damage bonus of your Searing, Magma Totems and your Fire, Frost, and Nature spells by X%.
Elemental Fury is a Shaman talent that increases spell critical strike damage bonus by 20% each rank to a maximum of 100%. The additional damage for critical strikes makes this a popular talent for Shamans who go deep into the Elemental tree.
Spell critical strike bonus is normally 50% of base spell damage, meaning a spell that hits for 1000 will crit for 1500, a bonus of 500 damage. Elemental Fury increases the bonus damage by 100%. That means, the bonus damage for this example would be 1000, for a total crit of 2000.
Because of the heavy reliance on critical hits by Elemental Shaman, this talent is a staple of the tree.