Arc

ArcBarrageable, Spell, AoE, Lightning, Chaining, Payoff
Tier: 5
Level: (1-20)
Cast Time: 1.10 sec
Critical Strike Chance: 9.00%An arc of Lightning stretches from the caster to a targeted enemy and Chains on to other nearby enemies. Shocked enemies Hit release damaging pulses.Arc
Deals (3-82) to (17-462) Lightning Damage
Chains (5-8) times

Pulse
Deals (5-49) to (31-277) Lightning Damage
Pulse radius is 1.5 meters

Additional Effects From 1-20% Quality:
+(0.1-2)% more Damage for each remaining ChainSkills can be managed in the Skills Panel.

Acquisition
Drop restricted
It can be obtained by engraving an Uncut Skill Gem.Metadata
Item class: Skill Gem
Metadata ID: Metadata/Items/Gems/SkillGemArc

Arc is a lightning spell skill that fires lightning at the target, which chains to hit nearby enemies. When it hits a shocked enemy, it releases a pulse that deals damage around it.

Skill functions and interactions

Arc can't shock.

Gem level progression

Level			Mana Cost	Lightning Damage	Chains
1	0	0	8	1 to 13	—
2	3	9	9	1 to 17	—
3	6	14	11	1 to 24	—
4	10	21	12	2 to 31	—
5	14	28	14	2 to 39	—
6	18	35	17	3 to 48	—
7	22	41	19	3 to 58	—
8	26	48	22	4 to 69	—
9	31	57	24	4 to 82	—
10	36	65	28	5 to 96	—
11	41	74	31	6 to 112	—
12	46	82	35	7 to 130	—
13	52	92	39	8 to 151	—
14	58	103	44	9 to 174	—
15	64	113	49	10 to 199	—
16	66	116	54	12 to 228	—
17	72	126	60	14 to 261	—
18	78	137	67	16 to 298	—
19	84	147	74	18 to 339	—
20	90	157	81	20 to 386	—

Recommended support gems

The following support gems are recommendations by GGG as listed in-game, and do not necessarily reflect optimal combinations or the views of the wiki.

Gem tier	Support gems
I		Controlled DestructionControlled DestructionSupport, Spell Category: Controlled Destruction Tier: 1Support Requirements: +5 IntSupports Spells that Hit enemies, boosting their damage but preventing them from dealing Critical Hits.Supported Spells deal 25% more Hit Damage Supported Skills cannot deal Critical HitsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	UnleashUnleashSupport, Spell Category: Unleash Tier: 1 Cost & Reservation Multiplier: 150%Support Requirements: +5 IntSupports Spells you cast yourself, making their effect reoccur when cast. Cannot support Channelling Skills or Skills with a Cooldown.Supported Spells gain a Seal every 200% of cast time, to a maximum of 2 Seals Supported Spells are Unsealed when cast, and their effects Reoccur for each Seal lost Supported Skills deal 50% less Damage when ReoccurringPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
II		Lightning PenetrationLightning PenetrationSupport, Lightning Category: Lightning Penetration Tier: 2 Cost & Reservation Multiplier: 120%Support Requirements: +5 DexSupports any skill that Hits enemies, making those Hits Penetrate enemy Lightning resistance.Supported Skills Penetrate 30% Lightning ResistancePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Mana FlareMana FlareSupport, Spell, AoE, Trigger, Fire, Critical Tier: 2Support Requirements: +5 IntSupports any Spell that Hits enemies, causing it to trigger a Mana Flare on Critical Hit. The Mana Flare consumes your Mana to deal Fire damage. Cannot support the skills of Minions.Support Supported Skills trigger Mana Flare on Critical Hit Mana Flare Cooldown Time: 1.00s Cast Time: 1.00s Critical Hit Chance: 7.00% Consumes 25% of current Mana to deal that much Fire damage Flare radius is 2 metresPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
III	Elemental DischargeElemental DischargeSupport, Spell, AoE, Trigger, Lightning, Cold, Fire, Payoff Tier: 3Support Requirements: +5 IntSupports any Spell that Hits enemies, causing it to consume Elemental Ailments on hit to trigger an Elemental Discharge. Cannot support the skills of Minions.Support Supported Skills Cannot inflict Freeze, Shock or Ignite Supported Skills Consume Freeze, Shock and Ignite on hit to trigger Elemental Discharge Elemental Discharge Cooldown Time: 1.00s Cast Time: 1.00s Critical Hit Chance: 10.00% Consuming Freeze deals 80% to 120% of your Intelligence as Cold Damage Consuming Ignite deals 40% to 60% of your Intelligence as Fire Damage Consuming Shock deals 1% to 120% of your Intelligence as Lightning Damage Discharge radius is 2 metresPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.	Elemental FocusElemental FocusSupport Category: Elemental Focus Tier: 3Support Requirements: +5 IntSupports any skill that Hits enemies, causing it to deal more Elemental Damage but be unable to inflict Elemental Ailments.Supported Skills deal 25% more Elemental Damage Supported Skills cannot inflict Elemental AilmentsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Lightning MasteryLightning MasterySupport, Lightning Category: Mastery Tier: 5Support Requirements: +5 IntSupports Lightning skills, granting them an additional level. Does not support skills which do not have levels.+1 to Level of Supported Lightning SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
IV
V

Item acquisition

Arc has restrictions on where or how it can drop.

It can be obtained by engraving an Uncut Skill Gem.

Alternate skill effects

Arc has the following alternate skill effects:

Item	Description

Version history

Version	Changes
0.3.0	Arc: Is now a Projectile. It no longer causes explosions against shocked enemies and is no longer a payoff skill. It now chains 6-9 times at Gem levels 5-20 (previously 5-8). It now has 50% more shock magnitude, and can now consume a lightning infusion to chain additional times and deal more damage. Now deals 2-39 damage at Gem level 5 (previously 5-31), scaling up to 20-386 damage at gem level 20 (previously 49-277). Quality now provides 0-10% chance to not remove an Infusion but still count as consuming them (previously 0-2% more Damage for each remaining Chain).
0.2.1	Added "Barrageable" gem tag.[Undocumented]
0.2.0f	Improved the visual effects of Arc's explosions on hitting a shocked target.
0.2.0e	Arc now releases damaging pulses when Shocked enemies are Hit, but can no longer Shock. It does not consume the Shock. The Arc now deals 9 to 51 at Gem level 1 (previously 9 to 50), scaling up to 82 to 462 at Gem level 20 (previously 72 to 410). The Pulse deals 5 to 31 Lighting Damage at Gem level 1, scaling up to 49 to 277 at Gem level 20, and has a radius of 1.5 metres. Added "AoE" and "Payoff" gem tags.[Undocumented]
0.2.0	Many Skills have had their base damage and/or damage growth per level rebalanced. Most of these changes are not specifically mentioned below as the changes are too widespread. Arc no longer deals more Damage for each remaining Chain, and Chains 6-8 times at Gem levels 5-20 (previously 2-5). Quality now provides 0-2% more Damage for each remaining Chain (previously 0-5%).
0.1.0	Introduced to the game.