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Arc

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ArcSpell, Chaining, Lightning
Mana Cost: (9-26)
Cast Time: 0.80 sec
Critical Strike Chance: 5.00%
Damage Effectiveness: 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.Per 1% Quality:
0.5% chance to Shock enemies
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 icon.pngArc inventory icon.png
Acquisition
Level: 12
Purchase Costs
Normal1x Orb of Transmutation
Sell Price
1x Scroll Fragment
Miscellaneous
Item class: Active Skill Gems
Metadata ID: Metadata/Items/Gems/SkillGemArc

Arc skill screenshot.jpg

Arc is a lightning spell that creates a chaining pulse.

Skill functions and interactions

  • Since it is not a projectile, Arc cannot Pierce SupportPierce SupportSupport, Projectile
    Icon: p
    Mana Multiplier: 110%
    Supports projectile skills.Per 1% Quality:
    Supported Skills deal 0.5% increased Projectile Damage
    Projectiles 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.
    or Fork SupportFork SupportSupport, Projectile
    Icon: Y
    Mana 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:
    Supported Skills deal 0.5% increased Projectile Damage
    Supported Skills deal (30-11)% less Projectile Damage
    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.
    , and it cannot be supported with GreaterGreater Multiple Projectiles SupportSupport, Projectile
    Icon: P
    Mana Multiplier: 165%
    Requires Level 38Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    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.
    or LesserLesser Multiple Projectiles SupportSupport, Projectile
    Icon: l
    Mana Multiplier: 140%
    Requires Level 8Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills fire 2 additional Projectiles
    Supported Skills deal (25-16)% 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.
    Multiple Projectiles. Supporting Arc with Chain SupportChain SupportSupport, Chaining, Projectile
    Icon: c
    Mana Multiplier: 150%
    Requires Level 38Supports projectile skills, and any other skills that chain.Per 1% Quality:
    Supported Skills have 1% increased Projectile Speed
    Supported Skills Chain +2 times
    Supported Skills deal (50-31)% 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.
    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

LevelLvl.intelligenceMana
Cost
Lightning
Damage
# ChainsShock EffectExp.Total Exp.
1123397 to 37410%00
21539108 to 47411%15,24915,249
319481111 to 61412%41,51756,766
423561214 to 80413%81,983138,749
527641318 to 101414%147,968286,717
631731423 to 128515%250,557537,274
735811628 to 159516%405,086942,360
838881633 to 187517%447,7181,390,078
941941739 to 218518%615,3182,005,396
10441001845 to 254519%834,6392,840,035
11471061952 to 295620%1,570,7604,410,795
12501132060 to 342621%1,633,9876,044,782
13531192170 to 395622%2,151,0308,195,812
14561252280 to 456623%2,812,18911,008,001
15591322392 to 524624%5,099,36016,107,361
166213824106 to 602725%9,400,73125,508,092
176414224116 to 659726%15,273,36640,781,458
186614625127 to 721727%26,286,58267,068,040
196815125139 to 789728%62,890,590129,958,630
207015526152 to 862729%212,046,017342,004,647
217215926166 to 942830%N/AN/A
2274N/A26181 to 1028831%N/AN/A
2376N/A27198 to 1122832%N/AN/A
2478N/A28216 to 1223833%N/AN/A
2580N/A29235 to 1333834%N/AN/A
2682N/A30256 to 1453935%N/AN/A
2784N/A30279 to 1582936%N/AN/A
2886N/A30304 to 1721937%N/AN/A
2988N/A31330 to 1873938%N/AN/A
3090N/A32359 to 2036939%N/AN/A
3191N/A32375 to 21231039%N/AN/A
3292N/A32391 to 22141040%N/AN/A
3393N/A33407 to 23081040%N/AN/A
3494N/A33424 to 24051041%N/AN/A
3595N/A33442 to 25071041%N/AN/A
3696N/A33461 to 26131142%N/AN/A
3797N/A34480 to 27221142%N/AN/A
3898N/A34501 to 28371143%N/AN/A
3999N/A34522 to 29551143%N/AN/A
40100N/A35543 to 30791144%N/AN/A

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.Stats
EnchantmentArcDamage16625% increased Arc Damage
EnchantmentArcDamage27540% increased Arc Damage
EnchantmentArcDamagePerChain1__66Arc deals 8% increased Damage for each time it has Chained
EnchantmentArcDamagePerChain275Arc deals 12% increased Damage for each time it has Chained
EnchantmentArcNumOfAdditionalProjectilesInChain166Arc Chains an additional time
EnchantmentArcNumOfAdditionalProjectilesInChain275Arc Chains an additional time
EnchantmentArcShockChance166Arc has +20% chance to Shock
EnchantmentArcShockChance275Arc has +30% chance to Shock

Alternate skill effects

Name Cost Description
Automaton Arc Effect
Automaton Arc EffectArc SkinYour Arc becomes an automaton effect.
Shop Item Coin.png120 Replaces the standard effect on an ArcArcSpell, Chaining, Lightning
Mana Cost: (9-26)
Cast Time: 0.80 sec
Critical Strike Chance: 5.00%
Damage Effectiveness: 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.Per 1% Quality:
0.5% chance to Shock enemies
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 icon.png
gem with an automaton version.

Shop Item Video Icon.png Preview
Purple Arc
Purple ArcArc Skin
Stack Size: 20
Your Arc becomes a Purple Effect.
Shop Item Coin.png120 Replaces the standard effect on an ArcArcSpell, Chaining, Lightning
Mana Cost: (9-26)
Cast Time: 0.80 sec
Critical Strike Chance: 5.00%
Damage Effectiveness: 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.Per 1% Quality:
0.5% chance to Shock enemies
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 icon.png
skill gem with a purple effect.

Shop Item Video Icon.png Preview

Item acquisition
Questionmark.png

Quest reward

This skill is given as quest reward for the following quests:
Class →WitchShadowRangerDuelistMarauderTemplarScion
Quest ↓
The Siren's Cadence
Act 1

Vendor reward

This skill 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

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
  • ArcArcSpell, Chaining, Lightning
    Mana Cost: (9-26)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 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.Per 1% Quality:
    0.5% chance to Shock enemies
    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 icon.png
    and Vaal ArcVaal ArcVaal, Spell, Chaining, Lightning, Duration
    Souls Per Use: 25 (N) /
    Can Store 1 Use(s)
    Soul Gain Prevention: 4.000 sec
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 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:
    1.5% increased Shock Duration on enemies
    Deals (38-924) to (64-1539) Lightning Damage
    100% chance to Shock enemies
    Chains +(5-9) Times
    100% increased Effect of Shock
    100% increased Shock Duration on enemies
    15% more Damage for each remaining Chain
    Base duration is 4 seconds
    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.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.