Combustion

When activated, this spell increases your critical strike damage bonus with Mage Fire damage spells by 150% and causes each of your Mage Fire damage spell hits to increase your critical strike chance with Mage Fire damage spells by 0%. This effect lasts 30 seconds, which renews every time you gain a stack, or until you have caused 3 non-periodic critical strikes with Mage Fire spells. @ext:The critical strike bonus damage is increased by 50% versus players.:ext@