Firestorm

FirestormSpell, AoE, Duration, Fire
Level: (1-20)
Cost: (13-25) Mana
Cast Time: 0.75 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 80%Requires Level 28Flaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.Base duration is 1.40 seconds
Deals (23-361) to (35-541) Fire Damage
One impact every 0.15 seconds
Base radius is 1.3 metres
First Impact has 100% more Area of Effect
First Impact deals 325% more Damage with Hits and Ailments
Maximum 3 Firestorms at a time

Additional Effects From 1-20% Quality:
Base radius is (0.01-0.2) metresPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Acquisition
Drop level: 28Vendor Offer
1x Scroll FragmentMetadata
Item class: Skill Gem
Metadata ID: Metadata/Items/Gems/SkillGemFirestorm

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, increasing the size of the spell area means that each monster within the spell area is within fewer individual fireball bursts; thus, less spell damage is dealt to any single 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 80% 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			Mana Cost	Fire Damage	Exp.	Total Exp.
1	28	67	13	23 to 35	0	0
2	31	73	14	29 to 43	199345	199345
3	34	79	15	36 to 54	285815	485160
4	37	85	16	44 to 66	401344	886504
5	40	92	16	54 to 81	554379	1440883
6	42	96	17	62 to 93	477437	1918320
7	44	100	18	71 to 106	583786	2502106
8	46	104	18	81 to 121	710359	3212465
9	48	109	19	92 to 138	1355511	4567976
10	50	113	19	105 to 157	1138877	5706853
11	52	117	20	119 to 178	1368233	7075086
12	54	121	20	135 to 202	1638338	8713424
13	56	125	21	153 to 229	1956648	10670072
14	58	130	21	173 to 260	3655184	14325256
15	60	134	22	196 to 294	3017327	17342583
16	62	138	22	222 to 333	7759995	25102578
17	64	142	23	251 to 376	15138193	40240771
18	66	146	24	283 to 425	26083825	66324596
19	68	151	24	320 to 480	62620247	128944843
20	70	155	25	361 to 541	211708088	340652931
21	72	159	25	407 to 610	N/A	N/A
22	74	N/A	26	458 to 688	N/A	N/A
23	76	N/A	26	516 to 774	N/A	N/A
24	78	N/A	27	581 to 872	N/A	N/A
25	80	N/A	27	654 to 980	N/A	N/A
26	82	N/A	28	735 to 1102	N/A	N/A
27	84	N/A	28	826 to 1238	N/A	N/A
28	86	N/A	29	927 to 1391	N/A	N/A
29	88	N/A	30	1041 to 1562	N/A	N/A
30	90	N/A	30	1169 to 1753	N/A	N/A
31	91	N/A	30	1238 to 1857	N/A	N/A
32	92	N/A	31	1311 to 1966	N/A	N/A
33	93	N/A	31	1388 to 2082	N/A	N/A
34	94	N/A	31	1470 to 2205	N/A	N/A
35	95	N/A	31	1556 to 2335	N/A	N/A
36	96	N/A	32	1648 to 2472	N/A	N/A
37	97	N/A	32	1744 to 2617	N/A	N/A
38	98	N/A	32	1846 to 2770	N/A	N/A
39	99	N/A	33	1954 to 2932	N/A	N/A
40	100	N/A	33	2068 to 3103	N/A	N/A

Gem quality

Type	Additional Effects per 1-20% Quality	Weight
Superior	Base radius is (0.01-0.2) metres	1

Item acquisition

Firestorm can drop anywhere.

Recipes

Firestorm can be created from the following recipes:

Amount	Part	Description	Meta
13	The CataclysmThe Cataclysm13Level 21 Spell Gem CorruptedThe 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 gem	A
6	The 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 gem	A
3	Gemcutter's PromiseGemcutter's Promise3Gem 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 gem with 20% quality	A
1	Gemcutter's IncubatorGemcutter's IncubatorStack Size: 10Adds an incubated Quality Gem item to an equippable item Item drops after killing {0} monstersRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters.	Random gem with 1–20% quality	A
1	The VoidThe Void1Reach into the Void and claim your prize.	Random divination card set exchange	A

Quest reward

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

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
Sever the Right Hand Act 3	✓	✗	✗	✗	✗	✓	✗

Vendor reward

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

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
A Fixture of Fate Act 3 Siosa	✓
Sever the Right Hand Act 3 Clarissa	✓	✓	✗	✗	✗	✓	✓
Fallen from Grace Act 6 Lilly Roth	✓

Related helmet enchantments

The following helmet enchantments affect Firestorm.

Note that helmet enchantments are no longer obtainable since version 3.23.0 and can only be obtained in permanent leagues as already enchanted items from before this patch.

Name		Labyrinth	Stats	Spawn Weighting
Enchantment Firestorm Damage 1	66	Merciless Labyrinth	25% increased Firestorm Damage	helmet 100
Enchantment Firestorm Damage 2	75	Eternal Labyrinth	40% increased Firestorm Damage	helmet 100
Enchantment Firestorm Duration 1	66	Merciless Labyrinth	20% increased Firestorm Duration	helmet 100
Enchantment Firestorm Duration 2	75	Eternal Labyrinth	30% increased Firestorm Duration	helmet 100
Enchantment Firestorm Explosion Area Of Effect 1	66	Merciless Labyrinth	16% increased Firestorm explosion Area of Effect	helmet 100
Enchantment Firestorm Explosion Area Of Effect 2	75	Eternal Labyrinth	24% increased Firestorm explosion Area of Effect	helmet 100

Alternate skill effects

Firestorm has the following alternate skill effects:

Item	Effect(s)
Celestial Firestorm EffectCelestial Firestorm EffectSkill Gem EffectYour Firestorm becomes a Celestial Effect.	Your Firestorm becomes a Celestial Effect.
Purple Firestorm EffectPurple Firestorm EffectSkill Gem EffectYour Firestorm becomes a Purple Effect.	Your Firestorm becomes a Purple Effect.
Siege Firestorm EffectSiege Firestorm EffectSkill Gem EffectYour Firestorm becomes a flaming siege assault	Your Firestorm becomes a flaming siege assault
Stygian Firestorm EffectStygian Firestorm EffectSkill Gem EffectYour Firestorm becomes a Stygian Effect.	Your Firestorm becomes a Stygian Effect.

Version history

Version	Changes
3.23.0	Quality now provides +0-0.2 metres to radius, instead of 0-20% increased Damage.
3.19.0	Firestorm now has one impact every 0.15 seconds (previously every 0.2 seconds).
3.17.0	Firestorm now deals 23 to 35 Fire Damage at gem level 1 (unchanged), up to 361 to 541 at gem level 20 (previously 250 to 375). Now has 80% Effectiveness of Added Damage at all gem levels (previously 55%).
3.16.0	Quality on Anomalous Firestorm no longer grants “(0.00)-(-0.06) seconds to Base Duration”, or “First Impact deals 0-60% more Damage with Hits and Ailments”. Instead, it now grants 0-10% chance to Ignite Enemies. Because of base Ignite damage changes, Ignite with the skill is now 150% higher. If using the Anomalous quality, the Ignite is now 110% higher.
3.15.0	Now deals 23 to 35 Fire Damage at gem level 1 (previously 22 to 33), up to 250 to 375 Fire Damage at gem level 20 (previously 207 to 311). Now has 55% Effectiveness of Added Damage (previously 50%). First Impact now deals 325% more Damage with Hits and Ailments (previously 250%).
3.13.0	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.
3.12.0	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: First Impact deals 3% more damage and Base duration is -0.003 seconds (per 1% quality) Divergent 1% reduced Enemy Stun Threshold (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.
3.11.0	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%).
3.6.0	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).
3.3.0	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).
2.1.0	Damage increased by around 20% higher at level 20.
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	Added new skill prototype - Firestorm: Flaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.