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Firestorm

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Firestorm
Active skill gem
  
Attribute(s)Intelligence
KeywordsFire, Spell, AoE, Duration
Cast time0.9 sec
Radius25 for storm, 10 for individual fireballs
Critical Strike Chance6%
Damage effectiveness30%
Per 1% QualityIncreased Area Damage 1%
Flaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.
Deals x–y Fire Damage
Base duration is 2.00 seconds
One fireball falls every 0.10 seconds
Screenshot of Firestorm
"Perhaps the most feared area effect skill in the Witch's arsenal, the mighty Firestorm skill is legendary for its power and cruelty. The incantation tears a rift in the heavens that showers a wide swath of ground in a rain of searing flames. These bolts pound down without mercy, burning everything they touch, then exploding violently to cause even more harm."
— Description on the official Path of Exile website[1]

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

Level Lvl. Int. Mana
Cost
Fire
Damage
Exp. Total Exp.
1 12 33 9 4–10 0 0
2 15 39 10 8–12 15,249 15,249
3 19 48 11 11–16 41,517 56,766
4 23 56 12 14–21 81,983 138,749
5 27 64 13 17–26 147,968 286,717
6 31 73 14 22–32 250,557 537,274
7 35 81 15 27–40 405,086 942,360
8 38 88 16 31–47 447,718 1,390,078
9 41 94 17 36–54 615,318 2,005,396
10 44 100 18 42–63 834,639 2,840,035
11 47 106 19 48–73 1,570,760 4,410,795
12 50 113 20 56–84 1,633,987 6,044,782
13 53 119 21 64–96 2,151,030 8,195,812
14 56 125 22 73–110 2,812,189 11,008,001
15 59 132 23 84–125 5,099,360 16,107,361
16 62 138 24 95–143 9,400,731 25,508,092
17 64 142 24 104–156 15,273,366 40,781,458
18 66 146 25 113–170 26,286,582 67,068,040
19 68 151 25 123–185 62,890,590 129,958,630
20 70 155 26 134–201 212,046,017 342,004,647
21 72 159 26 146–219 N/A N/A
22 74 27 159–238 N/A N/A
23 76 27 172–258 N/A N/A
24 78 28 187–281 N/A N/A
25 80 29 203–304 N/A N/A
26 82 30 220–330 N/A N/A
27 84 30 239–358 N/A N/A
28 86 30 259–388 N/A N/A
29 88 31 280–420 N/A N/A
30 90 32 303–455 N/A N/A

Quest reward

This skill is given as quest reward for the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
The Siren's Cadence
Act 1
Normal
no
yes
yes
no
no
no
no

Vendor reward

This skill can be bought at the listed npc vendors after completing the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
The Siren's Cadence
Act 1
Nessa
yes
yes
yes
no
no
no
no

Alternate skill effects

Name Cost Description
Siege Firestorm Effect
Siege Firestorm Effect.png
Shop Item Coin.png25 Replaces the standard projectile effects on a Firestorm gem with burning cages of spiked metal.

Shop Item Video Icon.png Preview

Version history

Version Changes
2.0.0
  • 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%.
1.0.4
  • 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.
1.0.0
  • Reduced mana cost.
0.11.2
  • 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.
0.11.1
  • 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.
0.9.12qq
  • Fixed a bug where monsters in high level areas would not do the correct Firestorm damage.
0.9.11i
  • Fixed the randomness when it was used with Traps.
0.9.11f
  • Increased the damage and made its cluster tighter.
0.9.9
  • Fixed a bug where the damage from Firestorm would not display on the client at the right time.
0.9.6
  • Changed Firestorm to be affected less by additional damage from support gems.
  • Fixed a bug where Firestorm could hit monsters through walls.
0.9.5
  • 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.
0.9.3c
  • Raised the overall damage and its high level damage scaling.
0.9.3
  • Firestorm has been added to the game.

References

  1. Path of Exile. "Intelligence skills". Official Path of Exile website.