Firestorm

Firestorm is a spell that rains numerous fiery bolts in an area, each bolt dealing area of effect fire damage.

Skill functions and interactions
Area of Effect: Increased AoE will increase both the area in which the fireballs randomly fall and also the radius of the individual fireball damage. Full spell damage is done at any point within the AoE of a fireball, however due to the fact that enemies take up an area and not simply a point, less spell damage is dealt to any given enemy as area increases. For this reason increasing the AoE of Firestorm paradoxically decreases the average damage dealt to a single target.

Duration: Increasing duration with either supports or passives will increase the total number of fireballs that fall before the spell ends.

Damage Effectiveness: Damage from secondary sources like 'added damage' supports or heralds applies at only 50% of their listed value.

Damage per Second: Due to the complexity of estimating actual DPS of the skill including all possible factors, ingame tooltip shows only average damage per hit of one fireball, with actual DPS of the skill being considerably higher. The closest currently available estimate can be obtained by using the damage calculator.

Version history

 * Firestorm has a new skillbar icon.
 * Now grants more damage with hits and ailments on the first impact (previously it granted more area damage, which does not apply to ailments).
 * The first impact now deals 250% more damage (from 150%) with hits and ailments.


 * Firestorm now calls down a large meteor that impacts the targeted location, followed by a series of smaller impacts at set intervals over the storm's duration. The base power of the spell has been significantly raised, so you are now limited to three Firestorms at any given time (any new storms created will replace the oldest).


 * Now requires level 28 at gem level 1 (from 12). Please be aware that existing low level characters with Firestorm socketed may have that gear slot disabled until the Firestorm gem is removed.
 * Now has a mana cost of 13 at gem level 1, up to 25 at gem level 20.
 * Now has an added damage effectiveness of 50%.
 * Now deals 22 to 33 fire damage at gem level 1, up to 207 to 311 fire damage at gem level 20.
 * Now has a base duration of 1.4 seconds with one impact every 0.2 seconds.
 * The first impact now has 100% more area of effect and deals 150% more damage.
 * Now has alternative quality:
 * Anomalous: and  (per 1% quality)
 * Divergent (per 1% quality)


 * Now offered to the Witch and Templar for completing Sever the Right Hand, and can be purchased from Clarissa by the Shadow and Scion.


 * The visual effects have been improved.
 * Now deals 7 to 11 Fire Damage at gem level 1 (from 4 to 11).
 * Now has an added Damage effectiveness of 45% (from 30%).


 * Mana Cost at gem level 20 is now 25 (was 26).
 * Now deals 4 to 11 Fire damage at gem level 1 (unchanged) and 200 to 300 Fire damage at gem level 20 (from 202 to 302).
 * Now has a cast time of 0.75 seconds (from 0.9).


 * Now deals 4-11 fire damage at gem level 1 (up from 4-10), up to 202-302 fire damage at gem level 20 (up from 162-243).


 * Damage increased by around 20% higher at level 20.


 * Firestorm: Had a very slight damage buff. Area of effect of explosions increased by 11% (9 to 10). It now grants 1% area damage per 1% quality instead of reduced delay between fireballs. The Duration of Firestorm has been increased from 1.3 seconds to 2 seconds at all levels. Base Cast Speed has been increased from a cast time of 1 second to 900ms. Critical Strike Chance has been increased from 5% to 6%.


 * Firestorm: The radius of the area that fireballs land in has been increased by 39%. The delay between strikes has been reduced from 0.15 seconds to 0.10 seconds. Damage has been increased by 35%. The quality bonus has been reduced by 33.33% to match the reduced projectile delay.


 * Reduced mana cost.


 * The damage done by the Firestorm spell when used by all versions of Ambrosia and Merciless Fire Fury has been increased. Merciless Gravicius's Firestorm has been very slightly increased in damage.


 * Spells with Damage Effectiveness no longer have their own damage affected by Damage Effectiveness. Damage values on these skills have been updated to reflect this.


 * Fixed a bug where monsters in high level areas would not do the correct Firestorm damage.


 * Fixed the randomness when it was used with Traps.


 * Increased the damage and made its cluster tighter.


 * Fixed a bug where the damage from Firestorm would not display on the client at the right time.


 * Changed Firestorm to be affected less by additional damage from support gems.
 * Fixed a bug where Firestorm could hit monsters through walls.


 * Modified Firestorm's behaviour so that the explosions have a larger radius and are more likely to fall near the centre of the affected area.
 * Doubled the number of fireballs that fall and rebalanced damage around these changes.


 * Raised the overall damage and its high level damage scaling.


 * Firestorm has been added to the game.
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