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FirestormSpell, AoE, Duration, Fire
Radius: 25 / 10
Mana Cost: (13-25)
Soul Gain Prevention: 0.001 sec
Cast Time: 0.75 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 50%
Requires Level 28Flaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.Per 1% Quality:1231% increased DamageFirst Impact deals 3% more damage
Base duration is 0 seconds
1% reduced Enemy Stun Threshold
Base duration is 1.4 seconds
Deals (22-207) to (33-311) Fire Damage
One impact every 0.2 seconds
First Impact deals 150% more damage
First Impact has 100% more area of effect
Maximum 3 Firestorms at a time
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Firestorm skill icon.pngFirestorm inventory icon.png
Level: 28
Purchase Costs
Normal1x Orb of Chance
Sell Price
1x Scroll Fragment
Item class: Active Skill Gems
Metadata ID: Metadata/Items/Gems/SkillGemFirestorm

Firestorm skill screenshot.jpg

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 30% 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.

Gem level progression

Exp.Total Exp.
128671322 to 3300
231731426 to 39199,345199,345
334791531 to 47285,815485,160
437851637 to 56401,344886,504
540921644 to 66554,3791,440,883
642961749 to 74477,4371,918,320
7441001855 to 83583,7862,502,106
8461041861 to 92710,3593,212,465
9481091968 to 1021,355,5114,567,976
10501131976 to 1141,138,8775,706,853
11521172084 to 1261,368,2337,075,086
12541212093 to 1401,638,3388,713,424
135612521104 to 1551,956,64810,670,072
145813021115 to 1723,655,18414,325,256
156013422127 to 1903,017,32717,342,583
166213822140 to 2107,759,99525,102,578
176414223155 to 23215,138,19340,240,771
186614624171 to 25626,083,82566,324,596
196815124188 to 28262,620,247128,944,843
207015525207 to 311211,708,088340,652,931
217215925228 to 343N/AN/A
2274N/A26251 to 377N/AN/A
2376N/A26276 to 415N/AN/A
2478N/A27304 to 456N/AN/A
2580N/A27334 to 501N/AN/A
2682N/A28367 to 550N/AN/A
2784N/A28403 to 604N/AN/A
2886N/A29442 to 663N/AN/A
2988N/A30485 to 727N/AN/A
3090N/A30531 to 797N/AN/A
3191N/A30556 to 834N/AN/A
3292N/A31582 to 873N/AN/A
3393N/A31609 to 914N/AN/A
3494N/A31638 to 956N/AN/A
3595N/A31667 to 1001N/AN/A
3696N/A32698 to 1047N/AN/A
3797N/A32731 to 1096N/AN/A
3898N/A32764 to 1147N/AN/A
3999N/A33800 to 1199N/AN/A
40100N/A33836 to 1255N/AN/A

Item acquisition

Upgrade paths

This item can be acquired through the following upgrade paths or vendor recipes:

6The FoxThe Fox6Level 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox."
- Ezomyte Proverb
random level 20 gemAutomatic
13The CataclysmThe Cataclysm13Level 21 Spell Gem
The mighty warriors traded in blows, the nimble archers in arrows, yet it was the brazen thaumaturgists who would bring catastrophe to all.
random corrupted level 21 Spell gemAutomatic
3Gemcutter's PromiseGemcutter's Promise3Superior Gem
Quality: +20%
"I swore to use my position to help the people. What good is power when it just accumulates on the already-powerful?" - Erasmus, Imperial Gemcutter
random superior gem (Q20)Automatic

Related helmet enchantments

The following helmet enchantments affect Firestorm.

NameFor generated item/monster modifiers the minimum item/monster level respectively. Some generation types may not require this condition to be met, however item level restrictions may be raised to 80% of this value.StatsSpawn Weighting
Enchantment Firestorm Damage 16625% increased Firestorm Damagehelmet 100
default 0
Enchantment Firestorm Damage 27540% increased Firestorm Damagehelmet 100
default 0
Enchantment Firestorm Duration 16620% increased Firestorm Durationhelmet 100
default 0
Enchantment Firestorm Duration 27530% increased Firestorm Durationhelmet 100
default 0
Enchantment Firestorm Explosion Area Of Effect 16616% increased Firestorm explosion Area of Effecthelmet 100
default 0
Enchantment Firestorm Explosion Area Of Effect 27524% increased Firestorm explosion Area of Effecthelmet 100
default 0

Alternate skill effects

Firestorm has the following alternate skill effects:

Siege Firestorm EffectSiege Firestorm EffectSkill Gem EffectYour Firestorm becomes a flaming siege assaultYour Firestorm becomes a flaming siege assault

Version history

Version Changes
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.
  • 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.