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Arc

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ArcSpell, Chaining, Lightning
Mana Cost: (8-23)
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:
0.5% chance to Shock enemies
Deals (6-133) to (33-754) 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 (-10-9)% more 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 (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.
    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.
  • Spell Echo will be able to cast it twice instead of just one at a time.

Gem level progression

LevelLvl.intelligenceMana
Cost
Lightning
Damage
# ChainsShock EffectExp.Total Exp.
1123386 to 33410%00
2153997 to 41411%15,24915,249
31948109 to 54412%41,51756,766
423561112 to 70413%81,983138,749
527641216 to 89414%147,968286,717
631731320 to 112515%250,557537,274
735811425 to 139516%405,086942,360
838881529 to 163517%447,7181,390,078
941941634 to 191518%615,3182,005,396
10441001639 to 223519%834,6392,840,035
11471061746 to 258620%1,570,7604,410,795
12501131853 to 299621%1,633,9876,044,782
13531191961 to 346622%2,151,0308,195,812
14561251970 to 399623%2,812,18911,008,001
15591322081 to 458624%5,099,36016,107,361
16621382193 to 526725%9,400,73125,508,092
176414221102 to 577726%15,273,36640,781,458
186614622111 to 631727%26,286,58267,068,040
196815122122 to 690728%62,890,590129,958,630
207015523133 to 754729%212,046,017342,004,647
217215924145 to 824830%N/AN/A
2274N/A24159 to 900831%N/AN/A
2376N/A25173 to 982832%N/AN/A
2478N/A25189 to 1070833%N/AN/A
2580N/A26206 to 1167834%N/AN/A
2682N/A26224 to 1271935%N/AN/A
2784N/A27244 to 1384936%N/AN/A
2886N/A27266 to 1506937%N/AN/A
2988N/A28289 to 1639938%N/AN/A
3090N/A28314 to 1782939%N/AN/A
3191N/A28328 to 18581039%N/AN/A
3292N/A29342 to 19371040%N/AN/A
3393N/A29356 to 20191040%N/AN/A
3494N/A29371 to 21051041%N/AN/A
3595N/A29387 to 21931041%N/AN/A
3696N/A30403 to 22861142%N/AN/A
3797N/A30420 to 23821142%N/AN/A
3898N/A30438 to 24821143%N/AN/A
3999N/A30456 to 25861143%N/AN/A
40100N/A31475 to 26941144%N/AN/A

Item acquisition
Questionmark.png

Quest reward

This item is given as 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

Microtransactions

The list below shows microtransactions for Arc.

ItemEffect(s)
Automaton Arc EffectAutomaton Arc EffectArc SkinYour Arc becomes an Automaton Effect.Your Arc becomes an Automaton Effect.
Purple ArcPurple ArcArc Skin
Stack Size: 20
Your Arc becomes a Purple Effect.
Your Arc becomes a Purple Effect.
Radiant ArcRadiant ArcArc SkinYour Arc becomes a Radiant Effect.Your Arc becomes a Radiant Effect.

Version history

Version Changes
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.
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: (8-23)
    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:
    0.5% chance to Shock enemies
    Deals (6-133) to (33-754) 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: 6.000 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:
    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
    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.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.