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 per Second: Due to the complexity of estimating the actual DPS of this skill including all possible factors, the in-game tooltip shows only the 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	22 to 33	0	0
2	31	73	14	26 to 39	199345	199345
3	34	79	15	31 to 47	285815	485160
4	37	85	16	37 to 56	401344	886504
5	40	92	16	44 to 66	554379	1440883
6	42	96	17	49 to 74	477437	1918320
7	44	100	18	55 to 83	583786	2502106
8	46	104	18	61 to 92	710359	3212465
9	48	109	19	68 to 102	1355511	4567976
10	50	113	19	76 to 114	1138877	5706853
11	52	117	20	84 to 126	1368233	7075086
12	54	121	20	93 to 140	1638338	8713424
13	56	125	21	104 to 155	1956648	10670072
14	58	130	21	115 to 172	3655184	14325256
15	60	134	22	127 to 190	3017327	17342583
16	62	138	22	140 to 210	7759995	25102578
17	64	142	23	155 to 232	15138193	40240771
18	66	146	24	171 to 256	26083825	66324596
19	68	151	24	188 to 282	62620247	128944843
20	70	155	25	207 to 311	211708088	340652931
21	72	159	25	228 to 343	N/A	N/A
22	74	N/A	26	251 to 377	N/A	N/A
23	76	N/A	26	276 to 415	N/A	N/A
24	78	N/A	27	304 to 456	N/A	N/A
25	80	N/A	27	334 to 501	N/A	N/A
26	82	N/A	28	367 to 550	N/A	N/A
27	84	N/A	28	403 to 604	N/A	N/A
28	86	N/A	29	442 to 663	N/A	N/A
29	88	N/A	30	485 to 727	N/A	N/A
30	90	N/A	30	531 to 797	N/A	N/A
31	91	N/A	30	556 to 834	N/A	N/A
32	92	N/A	31	582 to 873	N/A	N/A
33	93	N/A	31	609 to 914	N/A	N/A
34	94	N/A	31	638 to 956	N/A	N/A
35	95	N/A	31	667 to 1001	N/A	N/A
36	96	N/A	32	698 to 1047	N/A	N/A
37	97	N/A	32	731 to 1096	N/A	N/A
38	98	N/A	32	764 to 1147	N/A	N/A
39	99	N/A	33	800 to 1199	N/A	N/A
40	100	N/A	33	836 to 1255	N/A	N/A

Related helmet enchantments

The following helmet enchantments affect Firestorm.

Alternate skill effects

Firestorm has the following alternate skill effects:

Version history

Version	Changes
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	Firestorm has been added to the game.