This is, quite literally, a firestorm that shoots out onto your enemies when invoked. This skill is similar to the fire attack that Diablo uses at the end of Act IV; powerful and especially useful in the first two Acts. The charges of fire that Firestorm releases will travel through enemies, also striking foes that aren't directly in front of your Druid. Putting a few points into this skill is important not only because you'll use this skill, but also because it's a prerequisite for other skills, such as Molten Boulder. Firestorm initially does 3-7 points of damage per second, but ramps up (damage-wise) with every skill point you drop into it. It also has a cool-down time so that it cannot be used in quick succession.[1]
References[]
↑Diablo II Ultimate Strategy Guide, page 110. Blizzard Entertainment, 2001.