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FirestormSpell, AoE, Duration, Fire
Radius: 25 / 10
Mana Cost: (9-26)
Cast Time: 0.90 sec
Critical Strike Chance: 6.00%
Damage Effectiveness: 30%
Requires Level 12Flaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.Per 1% Quality:
1% increased Damage
Deals (4-202) to (11-302) Fire Damage
Base duration is 2 seconds
One impact every 0.1 seconds
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: 12
Purchase Costs
Normal1x Orb of Transmutation
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. This is why, contrary to popular belief, increasing the AoE of Firestorm decreases the average number of hits to 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.
1123394 to 1100
21539109 to 1315,24915,249
319481112 to 1841,51756,766
423561216 to 2481,983138,749
527641320 to 30147,968286,717
631731426 to 39250,557537,274
735811533 to 49405,086942,360
838881639 to 58447,7181,390,078
941941746 to 69615,3182,005,396
10441001854 to 81834,6392,840,035
11471061964 to 951,570,7604,410,795
12501132074 to 1121,633,9876,044,782
13531192187 to 1302,151,0308,195,812
145612522101 to 1522,812,18911,008,001
155913223118 to 1775,099,36016,107,361
166213824137 to 2059,400,73125,508,092
176414224151 to 22615,273,36640,781,458
186614625166 to 24926,286,58267,068,040
196815125183 to 27562,890,590129,958,630
207015526202 to 302212,046,017342,004,647
217215926222 to 333N/AN/A
2274N/A27244 to 366N/AN/A
2376N/A27268 to 402N/AN/A
2478N/A28294 to 442N/AN/A
2580N/A29323 to 485N/AN/A
2682N/A30355 to 532N/AN/A
2784N/A30389 to 583N/AN/A
2886N/A30426 to 639N/AN/A
2988N/A31467 to 701N/AN/A
3090N/A32512 to 767N/AN/A
3191N/A32535 to 803N/AN/A
3292N/A32560 to 840N/AN/A
3393N/A33586 to 879N/AN/A
3494N/A33613 to 919N/AN/A
3595N/A33641 to 962N/AN/A
3696N/A33670 to 1006N/AN/A
3797N/A34701 to 1052N/AN/A
3898N/A34733 to 1100N/AN/A
3999N/A34767 to 1150N/AN/A
40100N/A35802 to 1202N/AN/A

Item acquisition

Quest reward

This item is given as quest reward for the following quests:

Class →WitchShadowRangerDuelistMarauderTemplarScion
Quest ↓
The Siren's Cadence
Act 1

Vendor reward

This item can be bought at the listed npc vendors after completing the following quests:

Class →WitchShadowRangerDuelistMarauderTemplarScion
Quest ↓
The Siren's Cadence
Act 1
A Fixture of Fate
Act 3
Fallen from Grace
Act 6
Lilly Roth

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
EnchantmentFireStormDamage16625% increased Firestorm Damagehelmet 100
default 0
EnchantmentFireStormDamage27540% increased Firestorm Damagehelmet 100
default 0
EnchantmentFirestormDuration16620% increased Firestorm Durationhelmet 100
default 0
EnchantmentFirestormDuration27530% increased Firestorm Durationhelmet 100
default 0
EnchantmentFirestormExplosionAreaOfEffect1668% increased Firestorm explosion Area of Effecthelmet 100
default 0
EnchantmentFirestormExplosionAreaOfEffect27512% increased Firestorm explosion Area of Effecthelmet 100
default 0


The list below shows microtransactions for Firestorm.

Siege Firestorm Effect
Siege Firestorm EffectFirestorm Skin
Stack Size: 20
Your Firestorm becomes a flaming siege assault
Your Firestorm becomes a flaming siege assault

Version history

Version Changes
  • 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.