Arc

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Arc is a chaining lightning spell skill that stretches from the caster to a targeted enemy. Arc can chain multiple times, and deals increased damage for each remaining chain.

Gem level progression

Level			Mana Cost
1	0	0	8
2	3	9	9
3	6	14	11
4	10	21	12
5	14	28	14
6	18	35	17
7	22	41	19
8	26	48	22
9	31	57	24
10	36	65	28
11	41	74	31
12	46	82	35
13	52	92	39
14	58	103	44
15	64	113	49
16	66	116	54
17	72	126	60
18	78	137	67
19	84	147	74
20	90	157	81

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 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.	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.	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
0.1.0	Introduced to the game.