Icestorm

Name	Icestorm
Skill Id	IcestormUniqueStaff12
Icon
Cast Time	0.75 sec
Level Req.	1
Critical Strike Chance	6%
Cost	22 mana
Attack Speed	100% of base
Attack Damage	100% of base
Effectiveness of Added Damage	100%
Base duration	1.00 sec
Icy bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies and chilling them, as well as causing patches of chilled ground. Skill damage is based on Intelligence.
Base duration is 1.00 seconds Deals 5 to 7 base Cold Damage per 10 Intelligence One impact every 0.20 seconds Base radius is 1.6 metres Maximum 5 Icestorms at a time 0.10 seconds additional Base Duration per 100 Intelligence

Icestorm is a cold spell only available through The Whispering IceThe Whispering Ice
Vile StaffWarstaff
Physical Damage: 41-76
Critical Strike Chance: 6.10%
Attacks per Second: 1.30
Weapon Range: 1.3 metresRequires Level 33, 59 Str, 59 Int+18% Chance to Block Attack Damage while wielding a Staff+1 to Level of Socketed Support Gems
Grants Level 1 Icestorm Skill
Plays Whispering Ice sound on killing a rare Monster (Hidden)
(14-18)% increased Intelligence
(8-12)% increased Cast Speed
1% increased Spell Damage per 10 IntelligenceGuard your darkest thoughts well, for they are
the cracks through which the Nightmare crawls..

Skill functions and interactions

Intelligence: Icestorm's defining characteristic is that, while it is only ever a level 1 skill, its overall effectiveness can be increased with points into the Intelligence stat. In addition to the percentage-increase to all spell damage for every 10 points of Intelligence from The Whispering Ice staff itself, the skill also gains a flat 5 to 7 added cold damage for every 10 points of Intelligence. For every 100 points of Intelligence, the skill gains a base 0.1 second to its duration.

Support Gems: As with Jaws of AgonyJaws of Agony
Supreme Spiked ShieldChance to Block: 24%
Evasion: (242-278)
Energy Shield: (49-57)
Movement Speed: -3%Requires Level 70, 85 Dex, 85 Int+5% chance to Suppress Spell DamageGrants Level 25 Bear Trap Skill
(18-28)% increased Trap Damage
(15-25)% increased Global Physical Damage
+(60-80) to maximum Life
-(18-14) Physical Damage taken from Attack Hits
25% chance to gain a Power Charge when you Throw a TrapOne wrong step triggers destruction.
Agony slowly dominates the will to live., support gems do not have to be linked together in order to apply to the innate skill Icestorm. This means that an unlinked six-socket The Whispering Ice is just as effective for modifying the effect of Icestorm as a six-linked The Whispering Ice.

Empower/Enhance/Enlighten: Due to Icestorm being an innate property on The Whispering Ice, and not an actual socketed gem, Empower SupportEmpower SupportExceptional, Support
Icon: +
Level: (1-3)
Cost & Reservation Multiplier: 130%Supports any skill gem. Once this gem reaches level 2 or above, will raise the level of supported gems. Cannot support skills that don't come from gems.+(0-2) to Level of Supported Skill Gems

Additional Effects From 1-20% Quality:
This Gem gains (5-100)% increased ExperienceThis 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 Skill Gem you wish to augment. Right click to remove from a socket., Enhance SupportEnhance SupportExceptional, Support
Icon: +
Level: (1-3)
Cost & Reservation Multiplier: 120%Supports any skill gem. Once this gem reaches level 2 or above, will raise the quality of supported gems. Cannot support skills that don't come from gems.+(0-16)% to Quality of Supported Skill Gems

Additional Effects From 1-20% Quality:
This Gem gains (5-100)% increased ExperienceThis 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 Skill Gem you wish to augment. Right click to remove from a socket., and Enlighten SupportEnlighten SupportExceptional, Support
Icon: +
Level: (1-3)
Cost & Reservation Multiplier: (100-92)%Supports any skill gem. Once this gem reaches level 2 or above, will apply a cost & reservation multiplier to supported gems. Cannot support skills that don't come from gems.
Additional Effects From 1-20% Quality:
This Gem gains (5-100)% increased ExperienceThis 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 Skill Gem you wish to augment. Right click to remove from a socket. do not affect Icestorm.

Totem, Mine, Trap: Icestorm can be supported by Spell Totem SupportSpell Totem SupportSupport, Spell, Totem
Icon: T
Level: (1-20)
Cost & Reservation Multiplier: 200%Requires Level 8Supports spell skills that are not triggered. Instead of casting that spell, you will summon a totem that casts the spell for you.Supported Skills deal (49-40)% less Damage
Supported Skills will summon a Totem which uses that Skill
Totem lasts 8 seconds
Supported Skills have 40% less Cast Speed

Additional Effects From 1-20% Quality:
Supported Skills have (0.5-10)% increased Totem Placement speedThis 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 Skill Gem you wish to augment. Right click to remove from a socket., Trap SupportTrap SupportSupport, Trap
Icon: T
Level: (1-20)
Cost & Reservation Multiplier: 120%Requires Level 8Supports spells, or attacks that use bows or wands. Instead of using that skill, you will throw a trap that will use the skill for you when an enemy walks near it. Traps cannot use channelling skills.Supported Attack Skills cannot be used with Melee Weapons
Trap lasts 4 seconds
Supported Skills deal (20-6)% less Trap Damage
Supported Skills have (0-19)% increased Trap Throwing Speed

Additional Effects From 1-20% Quality:
Supported Skills deal (0.5-10)% increased Trap 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 Skill Gem you wish to augment. Right click to remove from a socket., Blastchain Mine SupportBlastchain Mine SupportSupport, Mine
Icon: Y
Level: (1-20)
Cost & Reservation Multiplier: 50%Requires Level 8Supports spells, or attacks that use bows or wands. Instead of using that skill, you will throw a mine that will use the skill for you when you detonate it. Mines cannot use channelling skills.Supported Attack Skills cannot be used with Melee Weapons
Supported Skills deal (59-53)% less Damage
Mine lasts 5 seconds
Supported Skills have a Base Mine Detonation Time of 0.25 seconds
Supported Skills gain a Base Reservation equal to Base Mana and Life Cost
Supported Skills deal 5% more Damage for each prior Mine in Detonation Sequence

Additional Effects From 1-20% Quality:
(0.5-10)% increased Mine 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 Skill Gem you wish to augment. Right click to remove from a socket., High-Impact Mine SupportHigh-Impact Mine SupportMine, Support, AoE, Aura
Icon: Y
Level: (1-20)
Cost & Reservation Multiplier: 50%Requires Level 31Supports spells, or attacks that use bows or wands. Instead of using that skill, you will throw a mine that will use the skill for you when you detonate it. Mines cannot use channelling skills.Supported Attack Skills cannot be used with Melee Weapons
Mine lasts 5 seconds
Supported Skills gain a Base Reservation equal to Base Mana and Life Cost
Supported Skills have a Base Mine Detonation Time of 0.25 seconds
Supported Skills deal (56-50)% less Damage
Each Mine from Supported Skills applies 2% chance to deal Double Damage to Hits against Enemies near it, up to a maximum of 100%

Additional Effects From 1-20% Quality:
(0.5-10)% increased Mine 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 Skill Gem you wish to augment. Right click to remove from a socket..

Area of Effect: Increased AoE will increase both the area in which the ice shards randomly fall and also the radius of the individual ice shard damage. Full spell damage is done at any point within the AoE of a shard, 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 Icestorm decreases the average number of hits to single target. However, this is only true if the enemy remains within the AoE of Icestorm for its whole duration. Increasing the AoE can therefore be advisable for movement-heavy fights.

Duration: Increasing duration with either supports or passives will increase the total number of ice shards that fall before the spell ends. The duration of icestorms is also increased by 0.1 second per every 100 points of Intelligence. Additionally, the length of time the chilled ground remains also increases or decreases.

Damage Effectiveness: Flat damage from secondary sources like 'added damage' supports or heralds apply at 100% of their values. This includes the added cold damage for every 10 points of Intelligence.

Damage per Second: Due to the complexity of estimating actual DPS of the skill including all possible factors, in-game tooltip shows only average damage per hit of one ice shard, with actual DPS of the skill being considerably higher.

Strategy

Cast while Channelling SupportCast while Channelling SupportSupport, Channelling, Spell, Trigger
Icon: W
Level: (1-20)
Cost & Reservation Multiplier: 120%Requires Level 38Must support both a channelling skill and a non-channelling spell skill to work. The channelling skill will trigger a spell periodically while channelling. Cannot support skills used by totems, traps, or mines. Vaal skills and skills with a reservation cannot be triggered.Trigger a Supported Spell every (0.45-0.35) seconds while Channelling Supported Skills
Supported Triggered Spells deal 30% less Damage

Additional Effects From 1-20% Quality:
Supported Channelling Skills deal (0.5-10)% increased Damage
Supported Triggered Spells deal (0.5-10)% increased 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 Skill Gem you wish to augment. Right click to remove from a socket. allows skipping the long cast time, in the extreme case: going from 0.75 second cast times down to .30 second cast times.

Monster versions

The following monster also uses Icestorm. Some of them may different from the item skill version visually and mechanically:

• Rima, Deep Temptress (internal use id for the skill: IcestormSideAreaBoss)
• Vessel of the Vaal (internal use id for the skill: IncaBossIcestorm)
• Merveil, the Reflection (internal use id for the skill: MapMerveilIcestorm)
• Lunar Devotee as well as Harbinger Puppet (internal use id for the skill: CannibalIcestorm)
• Avatar of Winter and Avatar of Apocalypse from Death and TaxesDeath and Taxes
  Necropolis MapMap Level: 79
  Map Tier: 12
  Guild Character: ¿
  Item Quantity: +150%Unique Boss deals (30-35)% increased Damage
  Unique Boss has (25-30)% increased Attack and Cast Speed
  Unique Boss gives 20000% increased Experience
  Unique Boss drops (12-20) additional Currency ItemsSo the raiders danced,
  leading their foe ever west,
  towards certain death.Travel to this Map by using it in a personal Map Device. Maps can only be used once. unique map (internal use id for the skill: WestIcestorm)
• Otesha, the Giantslayer, a Mutewind warband leader (internal use id for the skill: WbColdLeaderIcestorm)
• Shade of a Templar, from Whakawairua TuahuWhakawairua Tuahu
  Strand MapMap Level: 70
  Map Tier: 3
  Guild Character: È
  Item Quantity: +(40-60)%
  Item Rarity: +(120-160)%Area contains many Totems
  Curses have 50% reduced effect on MonstersWe all began life in darkness, we shall all end it there.Travel to this Map by using it in a personal Map Device. Maps can only be used once. unique map (internal use id for the skill: DarkExileIcestorm)
• Tormented Temptress, from Whakawairua TuahuWhakawairua Tuahu
  Strand MapMap Level: 70
  Map Tier: 3
  Guild Character: È
  Item Quantity: +(40-60)%
  Item Rarity: +(120-160)%Area contains many Totems
  Curses have 50% reduced effect on MonstersWe all began life in darkness, we shall all end it there.Travel to this Map by using it in a personal Map Device. Maps can only be used once. unique map (internal use id for the skill: DarkSeawitchIcestorm)

Version history

Version	Changes
3.17.0	Now has an Added Damage effectiveness of 100% (previously 60%), which affects the 5 to 7 base Cold Damage per 10 Intelligence that the Skill grants (this is a buff).
3.15.0	Now deals 3-5 Cold Damage per 10 Intelligence (previously 2-4).
3.12.0	The Ice Storm skill has undergone a significant rebalance, with larger impacts falling in a smaller area meaning you are significantly more likely to hit targets within the area multiple times over the storm's duration than before: Now has 2 to 4 base Cold Damage per 10 Intelligence (from 1 to 3). Now has a base Duration of 1 second (from 1.5 seconds). Now gains 0.1 seconds of additional base duration per 100 intelligence (from 0.15 seconds). There is now 1 impact every 0.2 seconds (from every 0.1 seconds) Now has an Added Damage effectiveness of 60% (from 45%). Now has a maximum of 5 storms at a time (any more than that replace the oldest). Impacts now have a base radius of 16 units (from 10). Impacts can now land in an area with a base radius of 22 (from 25).
3.11.0	Now has an added damage effectiveness of 45% (from 30%).
3.6.0	Icestorm now has a 0.75 second cast time(was 1s) and a 6% chance to critically strike.(from 5%).
2.0.0	Added to the game via The Whispering IceThe Whispering Ice Vile StaffWarstaff Physical Damage: 41-76 Critical Strike Chance: 6.10% Attacks per Second: 1.30 Weapon Range: 1.3 metresRequires Level 33, 59 Str, 59 Int+18% Chance to Block Attack Damage while wielding a Staff+1 to Level of Socketed Support Gems Grants Level 1 Icestorm Skill Plays Whispering Ice sound on killing a rare Monster (Hidden) (14-18)% increased Intelligence (8-12)% increased Cast Speed 1% increased Spell Damage per 10 IntelligenceGuard your darkest thoughts well, for they are the cracks through which the Nightmare crawls..
Before 2.0.0	Introduced to the game as monster-only skill.