Arc

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ArcSpell, Chaining, Lightning
Level: (1-20)
Cost: (8-23) Mana
Cast Time: 0.70 sec
Critical Strike Chance: 5.00%
Effectiveness of Added Damage: 120%
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 (6-198) to (32-1122) 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

Additional Effects per 1% Quality:
0.5% chance to Shock enemies
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Arc skill icon.pngArc inventory icon.png
Acquisition
Drop level: 12
Vendor Offer
1x Scroll Fragment
Metadata
Item class: Skill Gem
Metadata ID: Metadata/Items/Gems/SkillGemArc

Arc skill screenshot.jpg


For the Vaal-themed counterpart, see Vaal Arc.

Arc is a lightning spell that creates a chaining pulse of electricity.

Skill functions and interactions

  • Chain: Arc deals 15% more damage per remaining chain. Arc gains base chains from gem level, and additional sources of chain such as Chain SupportChain SupportSupport, Chaining, Projectile
    Icon: c
    Level: (1-20)
    Cost & Reservation Multiplier: 150%
    Requires Level 38Supports projectile skills, and any other skills that chain.Supported Skills Chain +2 times
    Supported Skills deal (30-11)% less Damage with Hits

    Additional Effects per 1% Quality:
    Supported Skills have 0.5% increased Chaining range
    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.
    are also taken into account for this bonus.
    • Every time Arc chains, a secondary Arc is created that hits an additional nearby enemy. This secondary Arc cannot chain further.
    • Arc remembers the last two enemies hit by the main Arc, and will not hit these enemies again. This means at least 3 enemies are required before the main Arc can hit the same enemy twice.

Gem level progression

LevelRequired LevelRequired IntelligenceMana
Cost
Lightning
Damage
ChainsLightning
Ailment
Effect
Exp.Total Exp.
1123386 to 32+410%00
2153997 to 41+411%1524915249
319481010 to 56+412%4151756766
423561113 to 75+413%81983138749
527641217 to 98+414%147968286717
631731322 to 127+515%250557537274
735811429 to 162+516%405086942360
838881534 to 194+517%4477181390078
941941641 to 232+518%6153182005396
10441001649 to 276+519%8346392840035
11471061758 to 327+620%15707604410795
12501131868 to 387+621%16339876044782
13531191981 to 457+622%21510308195812
14561251995 to 538+623%281218911008001
155913220111 to 631+624%509936016107361
166213821131 to 740+725%940073125508092
176414221145 to 822+726%1527336640781458
186614622161 to 912+727%2628658267068040
196815122179 to 1012+728%62890590129958630
207015523198 to 1122+729%212046017342004647
217215924219 to 1242+830%N/AN/A
2274N/A24243 to 1375+831%N/AN/A
2376N/A25269 to 1522+832%N/AN/A
2478N/A25297 to 1683+833%N/AN/A
2580N/A26328 to 1859+834%N/AN/A
2682N/A26362 to 2054+935%N/AN/A
2784N/A27400 to 2268+936%N/AN/A
2886N/A27442 to 2503+937%N/AN/A
2988N/A28487 to 2761+938%N/AN/A
3090N/A28537 to 3044+939%N/AN/A
3191N/A28564 to 3196+1039%N/AN/A
3292N/A29592 to 3356+1040%N/AN/A
3393N/A29622 to 3522+1040%N/AN/A
3494N/A29652 to 3697+1041%N/AN/A
3595N/A29685 to 3880+1041%N/AN/A
3696N/A30719 to 4072+1142%N/AN/A
3797N/A30754 to 4273+1142%N/AN/A
3898N/A30791 to 4483+1143%N/AN/A
3999N/A30830 to 4703+1143%N/AN/A
40100N/A31871 to 4934+1144%N/AN/A

Gem quality

TypeStats (per 1% quality)Weight
Superior0.5% chance to Shock enemies50
Anomalous1% increased Chaining range100
Divergent0.5% increased Damage for each time this Skill has Chained50
Phantasmal1% reduced Enemy Stun Threshold20

Item acquisition
Questionmark.png

Arc can drop anywhere.

Recipes

Arc can be created from the following recipes:

AmountPartDescriptionMeta
13The CataclysmThe 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.
Random corrupted level 21 Spell gemA
6The 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 gemA
8Dying AnguishDying Anguish8Level 19 Gem
Alternate 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.
Random level 19 gem with 19% alternative qualityA
8The HookThe Hook8Level 21 Gem
Alternate Quality: +23%
Corrupted
Every obsession began with a single, innocent taste.
Random corrupted level 21 gem with 23% alternative qualityA
3Gemcutter'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% qualityA
1Gemcutter's IncubatorGemcutter's IncubatorStack Size: 10Adds an incubated Quality Gem item to an equippable item
Item drops after killing {0} 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.
Shift click to unstack.
Random gem with 1–20% qualityA
1The VoidThe Void1Reach into the Void and claim your prize.Random divination card set exchangeA

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.LabyrinthStatsSpawn Weighting
Enchantment Arc Damage 166Merciless Labyrinth25% increased Arc Damagehelmet 100
default 0
Enchantment Arc Damage 275Eternal Labyrinth40% increased Arc Damagehelmet 75
default 0
Enchantment Arc Damage Per Chain 166Merciless LabyrinthArc deals 8% increased Damage for each time it has Chainedhelmet 100
default 0
Enchantment Arc Damage Per Chain 275Eternal LabyrinthArc deals 12% increased Damage for each time it has Chainedhelmet 75
default 0
Enchantment Arc Num Of Additional Projectiles In Chain 175Eternal LabyrinthArc Chains an additional timehelmet 75
default 0
Enchantment Arc Shock Chance 166Merciless LabyrinthArc has +20% chance to Shockhelmet 100
default 0
Enchantment Arc Shock Chance 275Eternal LabyrinthArc has +30% chance to Shockhelmet 75
default 0

Alternate skill effects

Arc has the following alternate skill effects:

ItemEffect(s)
Automaton Arc EffectAutomaton Arc EffectSkill Gem EffectYour Arc becomes an Automaton Effect.Your Arc becomes an Automaton Effect.
Celestial Arc EffectCelestial Arc EffectSkill Gem EffectYour Arc becomes a Celestial Effect.Your Arc becomes a Celestial Effect.
Purple ArcPurple ArcSkill Gem EffectYour Arc becomes a Purple Effect.Your Arc becomes a Purple Effect.
Radiant Arc EffectRadiant Arc EffectSkill Gem EffectYour Arc becomes a Radiant Effect.Your Arc becomes a Radiant Effect.

Version history

Version Changes
3.17.0
  • Arc now deals 6 to 32 Lightning Damage at gem level 1 (previously 6 to 33), up to 198 to 1122 at gem level 20 (previously 133 to 754).
  • Now has 120% Effectiveness of Added Damage at all gem levels (previously 80%).
3.11.0
  • The visual effects have been improved.
3.9.0
  • The range at which Arc can chain to another enemy is now 35 units (from 25).
  • Arc has received visual improvements.
3.6.2
  • Arc's effect now visually hits monsters more centrally.
3.6.0
  • Mana Cost at gem level 1 is now 8 (was 9).
  • Mana Cost at gem level 20 is now 23 (was 26).
  • Now has a cast time of 0.7 seconds (from 0.8).
  • Now deals 6 to 33 Lightning damage at gem level 1 (from 7 to 37) and 133 to 754 Lightning damage at gem level 20 (from 152 to 862).
  • Now has an added damage effectiveness of 80% (from 90%).
  • Lowered the range at which Arc can chain from 50 units to 25 units.
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.
3.0.0
  • Arc now has 10% increased Shock Effect at gem level 1, gaining 1% per gem level.
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.
1.3.1
  • (PvP) Arc damage has been increased by 5%. The total reduction is now 5% (up from 10% reduction previously).
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
  • ArcArcSpell, Chaining, Lightning
    Level: (1-20)
    Cost: (8-23) Mana
    Cast Time: 0.70 sec
    Critical Strike Chance: 5.00%
    Effectiveness of Added Damage: 120%
    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 (6-198) to (32-1122) 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

    Additional Effects per 1% Quality:
    0.5% chance to Shock enemies
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Arc skill icon.png
    and Vaal ArcVaal ArcVaal, Spell, Chaining, Lightning, Duration
    Level: (1-20)
    Souls Per Use: 25
    Can Store 1 Use(s)
    Soul Gain Prevention: 2 sec
    Cast Time: 0.70 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.Base 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

    Additional Effects per 1% Quality:
    1.5% increased Duration of Lightning Ailments
    CorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Vaal Arc skill icon.png
    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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