Storm Burst

Storm BurstAoE, Spell, Lightning, Channelling, Duration, Physical
Mana Cost: (2-5)
Cast Time: 0.25 sec
Critical Strike Chance: 6.00%
Damage Effectiveness: 25%Requires Level 12Unleash orbs of energy while you channel that repeatedly jump towards the targeted location until their duration expires, dealing damage in small area after each jump. When you stop channelling, all remaining orbs explode, dealing higher damage in a larger area.Per 1% Quality:
0.5% increased Area of EffectDeals (6-114) to (8-171) Physical Damage
Exploding Orbs deal 75% of Skill Damage for each 0.4 seconds of remaining Duration
50% of Physical Damage Converted to Lightning Damage
Orbs jump every 0 seconds
+(0-2) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.Acquisition
Level: 12Purchase Costs

Normal

1x Orb of Transmutation

Sell Price
1x Scroll FragmentMiscellaneous
Item class: Active Skill Gems
Metadata ID: Metadata/Items/Gems/SkillGemStormBurst

Storm Burst is an active skill gem that unleashes orbs of energy while channelling. The orbs jump towards (or if targeting a nearby area, around) the targeted location and deals lightning damage to enemies.

Skill function and interaction

(Need orb creation time, i.e when do orbs start to be created after channeling has begun)

The orbs seem to jump at a 60° angle each time they move. (Needs confirmation)

The orbs deal damage when they are created and when they jump. Orbs jump every 0.4 seconds. Enemies who walk into the orbs while the orbs are stationary do not take damage. (Needs source/confirmation on whether orbs deal damage on creation and whether or not stationary orbs deal damage)

The base duration of each orb is 1.2 seconds, meaning an unmodified Storm Burst can theoretically hit an enemy 4 times per orb while channeling. (Needs confirmation/source, unsure of whether internal cooldown on orb hits exists or not, and needs source on base duration of orbs. Gem not showing duration on wiki. PoB says 1.2 second base duration)

Area of Effect: Modifiers to Area of Effect increase the area of the orb explosions, but do not affect how the orbs jump. This means that modifiers to area will increase the chance of an orb hitting a given target, and therefore the skill's DPS.

Hit Rate: With no modifiers to AoE, the orbs hit a single stationary target approximately ~92% of the time. This can be increased with modifiers to area, reaching an almost 100% hit rate at a total area modifier of +30%. Despite reducing hit rate, Concentrated Effect SupportConcentrated Effect SupportSupport, AoE
Icon: o
Mana Multiplier: 140%Requires Level 18Supports any skill with an area of effect, regardless of whether that skill deals damage.Per 1% Quality:
Supported Skills deal 0.5% increased Area DamageSupported Skills have 30% less Area of Effect
Supported Skills deal (35-54)% more Area DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket. can be a potent support gem option granting as little as ~40% more DPS with no modifiers to area or up to the full bonus with high amounts of AoE.

Gem level progression

Level					Physical Damage	Added Radius	Exp.	Total Exp.
1	12	14	21	2	6 to 8	N/A	0	0
2	15	17	25	2	7 to 10	N/A	15,249	15,249
3	19	21	30	2	9 to 14	N/A	41,517	56,766
4	23	24	35	3	12 to 17	N/A	81,983	138,749
5	27	28	41	3	15 to 22	N/A	147,968	286,717
6	31	32	46	3	18 to 27	N/A	250,557	537,274
7	35	36	51	3	23 to 34	1	405,086	942,360
8	38	38	55	3	26 to 40	1	447,718	1,390,078
9	41	41	59	4	31 to 46	1	615,318	2,005,396
10	44	44	63	4	35 to 53	1	834,639	2,840,035
11	47	47	67	4	41 to 61	1	1,570,760	4,410,795
12	50	49	71	4	47 to 71	1	1,633,987	6,044,782
13	53	52	75	4	54 to 81	1	2,151,030	8,195,812
14	56	55	79	5	62 to 93	2	2,812,189	11,008,001
15	59	58	83	5	71 to 106	2	5,099,360	16,107,361
16	62	60	87	5	81 to 121	2	9,400,731	25,508,092
17	64	62	90	5	88 to 132	2	15,273,366	40,781,458
18	66	64	92	5	96 to 144	2	26,286,582	67,068,040
19	68	66	95	5	105 to 157	2	62,890,590	129,958,630
20	70	68	98	5	114 to 171	2	212,046,017	342,004,647
21	72	70	100	5	124 to 186	3	N/A	N/A
22	74	N/A	N/A	6	135 to 202	3	N/A	N/A
23	76	N/A	N/A	6	146 to 219	3	N/A	N/A
24	78	N/A	N/A	6	159 to 238	3	N/A	N/A
25	80	N/A	N/A	6	172 to 258	3	N/A	N/A
26	82	N/A	N/A	6	187 to 280	3	N/A	N/A
27	84	N/A	N/A	6	203 to 304	3	N/A	N/A
28	86	N/A	N/A	6	220 to 329	4	N/A	N/A
29	88	N/A	N/A	6	238 to 357	4	N/A	N/A
30	90	N/A	N/A	7	257 to 386	4	N/A	N/A
31	91	N/A	N/A	7	268 to 402	4	N/A	N/A
32	92	N/A	N/A	7	279 to 418	4	N/A	N/A
33	93	N/A	N/A	7	290 to 435	4	N/A	N/A
34	94	N/A	N/A	7	302 to 452	4	N/A	N/A
35	95	N/A	N/A	7	314 to 470	4	N/A	N/A
36	96	N/A	N/A	7	326 to 489	4	N/A	N/A
37	97	N/A	N/A	7	339 to 509	4	N/A	N/A
38	98	N/A	N/A	7	353 to 529	4	N/A	N/A
39	99	N/A	N/A	7	367 to 550	4	N/A	N/A
40	100	N/A	N/A	7	381 to 572	5	N/A	N/A

Item acquisition

Quest reward

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

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
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 →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
The Siren's Cadence Act 1 Nessa	✓	✓	✗	✗	✗	✓	✓
A Fixture of Fate Act 3 Siosa	✓
Fallen from Grace Act 6 Lilly Roth	✓

Related helmet enchantments

The following helmet enchantments affect Storm Burst.

Name		Stats	Spawn Weighting
Enchantment Storm Burst Additional Object Chance 1	66	Storm Burst has a 10% chance to create an additional Orb	helmet 100 default 0
Enchantment Storm Burst Additional Object Chance 2	75	Storm Burst has a 15% chance to create an additional Orb	helmet 100 default 0
Enchantment Storm Burst Damage 1	66	25% increased Storm Burst Damage	helmet 100 default 0
Enchantment Storm Burst Damage 2	75	40% increased Storm Burst Damage	helmet 100 default 0
Enchantment Storm Burst Area Of Effect 1	66	8% increased Storm Burst Area of Effect	helmet 100 default 0
Enchantment Storm Burst Area Of Effect 2	75	12% increased Storm Burst Area of Effect	helmet 100 default 0

Version history

Version	Changes
3.6.3d	Storm Burst's tooltip now displays the frequency at which Orbs jump and the duration of Orbs.
3.6.0	No longer fires projectiles. Now creates orbs of energy while you channel that repeatedly jump towards the targeted location until their duration expires, dealing damage in small area after each jump. When you stop channelling, all remaining orbs explode, dealing higher damage in a larger area. This explosion deals more damage based on how much duration remains at the point you stop channeling. Now has a cast time of 0.25 seconds (from 0.65). Mana cost at gem level 1 is now 2 (was 4). Mana cost at gem level 20 is now 5 (was 10). Now deals Physical Damage, and converts 50% of Physical Damage to Lightning Damage. Now requires level 12 (from level 28). Now deals 6 to 8 Physical Damage at gem level 1, up to 114 to 174 Physical Damage at gem level 20. Now has an added damage effectiveness of 25% (from 40%). Now gains additional radius as the gem levels.
3.3.0	Now deals 31-47 lightning damage at gem level 1 (up from 9-13), up to 183-275 lightning damage at gem level 20 (up from 50-76). Now deals 65% more area damage (down from 250% more), triggered when channelling ceases. Now has an added damage effectiveness of 40% (up from 10%). Area of effect increased by 10%.
3.1.0	Now correctly modified by factors based on the state of the projectile (such as Powerful Precision`s "Projectiles have 100% increase Critical Strike Chance against Targets they Pierce").
3.0.0	Storm Burst has been added to the game.