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ArcSpell, Chaining, Lightning
Level: (1-20)
Cost: (9-26) Mana
Cast Time: 0.80 sec
Critical Strike Chance: 5.00%
Effectiveness of Added Damage: 90%
Requires Level 12An arc of lightning stretches from the caster to a targeted enemy and chains on to other nearby enemies. Each time the main beam chains it will also chain to a second enemy, but that secondary arc cannot chain further.Deals (7-152) to (37-862) Lightning Damage
10% chance to Shock enemies
Chains +(4-7) Times
(10-29)% increased Effect of Shock
15% more Damage for each remaining Chain
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Arc skill iconArc inventory icon
Acquisition
Area level: 12
Vendor Prices
Normal1x Orb of Transmutation
Vendor Offer
1x Scroll Fragment
Metadata
Item class: Active Skill Gems
Metadata ID: Metadata/Items/Gems/SkillGemArc

Arc skill screenshot
For the Vaal-themed counterpart, see Vaal Arc.

Arc is a lightning spell that creates a chaining pulse.

Skill functions and interactions

  • Since it is not a projectile, Arc cannot Pierce Support inventory iconPierce SupportPierce SupportSupport, Projectile
    Icon: p
    Level: (1-20)
    Cost & Reservation Multiplier: 120%
    Supports projectile skills.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased Projectile DamageProjectiles from Supported Skills Pierce 0.1 additional TargetsProjectiles from Supported Skills that have Pierced deal 2% increased DamageProjectiles from Supported Skills Pierce (2-4) additional Targets
    Supported Skills deal (0-19)% more Projectile Damage
    This 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.
    Pierce Support inventory icon
    or Fork Support inventory iconFork SupportFork SupportSupport, Projectile
    Icon: Y
    Level: (1-20)
    Cost & Reservation Multiplier: 130%
    Requires Level 31Supports projectile skills, making their projectiles fork into two projectiles the first time they hit an enemy and don't pierce it.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased Projectile DamageProjectiles from Supported Skills have 1% chance for an additional Projectile when ForkingProjectiles from Supported Skills Pierce an additional TargetSupported Skills deal (-10-9)% more Projectile Damage
    Projectiles from Supported Skills Fork
    This 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.
    Fork Support inventory icon
    , and it cannot be supported with Greater Multiple Projectiles Support inventory iconGreaterGreater Multiple Projectiles SupportSupport, Projectile
    Icon: P
    Level: (1-20)
    Cost & Reservation Multiplier: 150%
    Requires Level 38Supports projectile skills.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased Projectile DamageSupported Skills have 1% reduced Mana Cost
    Supported Skills have 0.5% increased Projectile Speed
    Projectiles Fired by Supported Skills have 1% increased Projectile spread
    Supported Skills fire 4 additional Projectiles
    Supported Skills deal (35-26)% less Projectile Damage
    This 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.
    Greater Multiple Projectiles Support inventory icon
    or Lesser Multiple Projectiles Support inventory iconLesserLesser Multiple Projectiles SupportSupport, Projectile
    Icon: l
    Level: (1-20)
    Cost & Reservation Multiplier: 130%
    Requires Level 8Supports projectile skills.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have 1% reduced Mana Cost
    Supported Skills have 0.5% increased Projectile Speed
    Projectiles Fired by Supported Skills have 1% increased Projectile spread
    Supported Skills fire 2 additional Projectiles
    Supported Skills deal (15-6)% less Projectile Damage
    This 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.
    Lesser Multiple Projectiles Support inventory icon
    Multiple Projectiles. Supporting Arc with Chain Support inventory iconChain SupportChain SupportSupport, Chaining, Projectile
    Icon: c
    Level: (1-20)
    Cost & Reservation Multiplier: 150%
    Requires Level 38Supports projectile skills, and any other skills that chain.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills have 1% increased Chaining rangeSupported Skills have 1% increased Projectile SpeedProjectiles Fired by Supported Skills have 4% chance not to Pierce EnemiesSupported Skills Chain +2 times
    Supported Skills deal (30-11)% less Damage with Hits
    This 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.
    Chain Support inventory icon
    will result in additional chains.
  • Arc will chain to a random target within a specified radius centered on last target struck. Arc cannot chain back to the same target immediately, and must bounce one more time before chaining to the previous target.
  • Arc, when not cast at any enemy, will target the nearest one within the skill's range.
  • Can be used in left mouse button slot to cast and move.

Gem level progression

LevelRequired LevelRequired IntelligenceMana
Cost
Lightning
Damage
# ChainsShock EffectExp.Total Exp.
1123386 to 334N/A00
2153997 to 414N/A1524915249
31948109 to 544N/A4151756766
423561112 to 704N/A81983138749
527641216 to 894N/A147968286717
631731320 to 1125N/A250557537274
735811425 to 1395N/A405086942360
838881529 to 1635N/A4477181390078
941941634 to 1915N/A6153182005396
10441001639 to 2235N/A8346392840035
11471061746 to 2586N/A15707604410795
12501131853 to 2996N/A16339876044782
13531191961 to 3466N/A21510308195812
14561251970 to 3996N/A281218911008001
15591322081 to 4586N/A509936016107361
16621382193 to 5267N/A940073125508092
176414221102 to 5777N/A1527336640781458
186614622111 to 6317N/A2628658267068040
196815122122 to 6907N/A62890590129958630
207015523133 to 7547N/A212046017342004647
217215924145 to 8248N/AN/AN/A
2274N/A24159 to 9008N/AN/AN/A
2376N/A25173 to 9828N/AN/AN/A
2478N/A25189 to 10708N/AN/AN/A
2580N/A26206 to 11678N/AN/AN/A
2682N/A26224 to 12719N/AN/AN/A
2784N/A27244 to 13849N/AN/AN/A
2886N/A27266 to 15069N/AN/AN/A
2988N/A28289 to 16399N/AN/AN/A
3090N/A28314 to 17829N/AN/AN/A
3191N/A28328 to 185810N/AN/AN/A
3292N/A29342 to 193710N/AN/AN/A
3393N/A29356 to 201910N/AN/AN/A
3494N/A29371 to 210510N/AN/AN/A
3595N/A29387 to 219310N/AN/AN/A
3696N/A30403 to 228611N/AN/AN/A
3797N/A30420 to 238211N/AN/AN/A
3898N/A30438 to 248211N/AN/AN/A
3999N/A30456 to 258611N/AN/AN/A
40100N/A31475 to 269411N/AN/AN/A

Item acquisition
Questionmark

Upgrade paths

This item can be acquired through the following upgrade paths or vendor recipes:

AmountIngredientGeneral
Notes
Type
8Divination card inventory iconDying AnguishDying Anguish card artDivination card frameDying Anguish8Level 19 Gem
Alternative Quality: +19%
Moribund, he gazed upon the journey taken as blood trickled down his chin. His eye closed on the city ahead that he would never call home.
Divination card inventory icon
random level 19 gem with 19% alternative qualityAutomatic
1Gemcutter's Incubator inventory iconGemcutter's IncubatorGemcutter's IncubatorAdds an incubated Quality Gem item to an equippable item
Item drops after killing # monsters
Quality GemRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters.
Gemcutter's Incubator inventory icon
random superior gemAutomatic
6Divination card inventory iconThe FoxThe Fox card artDivination card frameThe Fox6Level 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox."
- Ezomyte Proverb
Divination card inventory icon
random level 20 gemAutomatic
13Divination card inventory iconThe CataclysmThe Cataclysm card artDivination card frameThe Cataclysm13Level 21 Spell Gem
Corrupted
The mighty warriors traded in blows, the nimble archers in arrows, yet it was the brazen thaumaturgists who would bring catastrophe to all.
Divination card inventory icon
random corrupted level 21 Spell gemAutomatic
3Divination card inventory iconGemcutter's PromiseGemcutter's Promise card artDivination card frameGemcutter's Promise3Superior Gem
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
Divination card inventory icon
random superior gem with 20% qualityAutomatic
1Divination card inventory iconThe VoidThe Void card artDivination card frameThe Void1Reach into the Void and claim your prize.Divination card inventory iconrandom divination card set exchangeAutomatic

Quest reward

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

Class →WitchShadowRangerDuelistMarauderTemplarScion
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 →WitchShadowRangerDuelistMarauderTemplarScion
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 Arc.

NameFor generated item/monster modifiers the minimum item/monster level respectively. Some generation types may not require this condition to be met, however item level restrictions may be raised to 80% of this value.StatsSpawn Weighting
Enchantment Arc Damage 16625% increased Arc Damagehelmet 100
default 0
Enchantment Arc Damage 27540% increased Arc Damagehelmet 75
default 0
Enchantment Arc Damage Per Chain 166Arc deals 8% increased Damage for each time it has Chainedhelmet 100
default 0
Enchantment Arc Damage Per Chain 275Arc deals 12% increased Damage for each time it has Chainedhelmet 75
default 0
Enchantment Arc Num Of Additional Projectiles In Chain 175Arc Chains an additional timehelmet 75
default 0
Enchantment Arc Shock Chance 166Arc has +20% chance to Shockhelmet 100
default 0
Enchantment Arc Shock Chance 275Arc has +30% chance to Shockhelmet 75
default 0

Alternate skill effects

Arc has the following alternate skill effects:

ItemEffect(s)

Version history

Version Changes
3.3.0
  • Now has an added damage effectiveness of 90% (up from 70%).
  • Now deals 7-37 lightning damage at gem level 1 (up from 2-35), up to 152-862 lightning damage at gem level 20 (up from 47-886).
  • Now deals 15% more damage for each remaining chain.
  • Can now split to an extra enemy whenever it chains. These splits cannot then chain.
  • Chains 4 times at level 1, up to 7 times at level 20.
2.1.0
  • Damage increased by around 20% higher at level 20.
  • In addition to having more damage, Arc now increases in number of chains more often as it levels up. At level 20, it chains seven times. Previously this was five.
2.0.0
  • Damage reduced slightly at all levels. At player level 68, it should deal approximately 8% less damage.
1.2.0
  • We have reduced the damage by 15% at all levels.
  • Got +1% to critical hit chance bringing it to 5%
1.1.2
  • Arc inventory iconArcArcSpell, Chaining, Lightning
    Level: (1-20)
    Cost: (8-23) Mana
    Cast Time: 0.70 sec
    Critical Strike Chance: 5.00%
    Effectiveness of Added Damage: 80%
    Requires Level 12An arc of lightning stretches from the caster to a targeted enemy and chains on to other nearby enemies. Each time the main beam chains it will also chain to a second enemy, but that secondary arc cannot chain further.Per 1% Quality:1Superior2Anomalous3Divergent4Phantasmal0.5% chance to Shock enemies1% increased Chaining range0.5% increased Damage for each time this Skill has Chained1% reduced Enemy Stun ThresholdDeals (6-133) to (33-754) Lightning Damage
    10% chance to Shock enemies
    Chains +(4-7) Times
    (10-29)% increased Effect of Lightning Ailments
    15% more Damage for each remaining Chain
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Arc skill icon
    Arc inventory icon
    and Vaal Arc inventory iconVaal ArcVaal ArcVaal, Spell, Chaining, Lightning, Duration
    Level: (1-20)
    Souls Per Use: 25
    Can Store 1 Use(s)
    Soul Gain Prevention: 0 sec
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Effectiveness of Added Damage: 180%
    Requires Level 12A shocking arc of lightning stretches from the caster to a targeted enemy and chains to other nearby enemies. Each time the beam chains it will also chain simultaneously to a second enemy, but no enemy can be hit twice by the beams. Also grants a buff making you lucky when damaging enemies with Arc for a short duration.Per 1% Quality:1Superior1.5% increased Duration of Lightning AilmentsBase duration is 4 seconds
    Deals (38-924) to (64-1539) Lightning Damage
    100% chance to Shock enemies
    Chains +(5-9) Times
    100% increased Effect of Lightning Ailments
    100% increased Duration of Lightning Ailments
    15% more Damage for each remaining Chain
    Modifiers to Buff Duration also apply to this Skill's Soul Gain Prevention
    Corrupted
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Vaal Arc skill icon
    Vaal Arc inventory icon
    have had their damage increased by 60%. Arc and Vaal Arc can now no longer chain back to the same target immediately, but must now bounce one more time. Arc now increases in chain counts as the gem increases in level.
1.0.0
  • Reduced the mana cost.
  • Damage has been increased by around 23%.
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.
0.9.13
  • Arc has been added to the game.


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